12au7 in v1

    The v1 position has most effect on tone by the way. I've recently bought a Ray Samuels B-52, 2nd hand from a previous owner in the UK. The knob will be at something like 6, as opposed to the 4 it was at with the 12AX7, but it'll still be the same amount of power. I have not tried 12AU7 in V3. A Comparison of Current Production 12AX7 Tubes. Need vacuum tubes? Want to build your own amplifier? Have an unhealthy HiFi obsession? We've got you covered. For purpose of the headphone amplifier the 12AU7 tube will be used in a common cathode configuration, and the incoming signal will be amplified by approximately 10dB. Like many before me,obtaining different tubes becomes a personal quest in order to achieve the ultimate sound possible? I don't use the pre-out ) V3 is the phase splitter, and can also usefully reduce gain if you want a very smooth sound. 12AU7 is also known in Europe under its Mullard-Philips tube designation ECC82. 2A3 6CA7 6CA7-Z 6SL7 6SN7 12AT7-T 12AU7 12AU7-T 12AX7-LS 12AX7-T 211-T 211TII 274B 300B 300B-T 845-T 845TII ACME845 Cary 805AE Cary SLP-05 CV181-T CV181-Z EL34 EL34PH emission KT88 KT88-T KT88-Z / KT88-T/TII KT120 KT120-Z packaging Psvane psvane 845T Psvane HiFi Series tubes Psvane T-series psvane teflon caps quad RMA shipping Testing in China Ok, onto the V1. Wow ! I can immediately see why they say NOS tubes are better. There are many 12AX7 on the market today. I think you have a 4 pre QR correct? If that is the case, just keep in mind that V2 is the input stage for both channels and V1 is your clean channel second gain stage. 2K Not surprised you heard a change when you swapped v3, but in v1 and 2, its most likely the previous tubes and the new tubes were equal in quality. Welcome to the AudioAficionado. Summary of the AC-100 Preamp Circuit - The AC-100 was a hand wired ampliffier that used one half of a 12AU7 (V1) in the initial gain stage. 12AT7s are bright/thin. High gm valves are well suited to cathode follower part of the circuit (such as an ECC82 / 12AU7). The controls are, from left to right: on-off, volume, bass, and treble. I've tube the first channel with a 12AU7 for a cleaner sound and the second channel is a 12AX7. Replace the 12AT7 reverb driver with 12AU7 – Better reverb control. This is probably excessive. All tubes are burned in for 96 hours on our proprietary burned-in racks. The difference again is that the Gold pin tubes are a little smoother and richer sounding and the long plates have a fat, thick tone in the low mids. 6. Excellent quality vintage 12AX7 tubes at an affordable price. usually 12AX7 in V1 & V2 try 12AU7 in V1 for more clean headroom, 12AT7 in V2 for smoother breakup 6V6, 6L6, 5881, KY88, 6550, EL34 for power tube A simple way to check this out can be done by changing the 12AX7 tubes on your Phono preamp for a pair of 12AU7. What are the differences in the 12AU7 and 12AT7? P. V1 (usually the pre amp tube closest to the input jack) has the largest impact on your tone and gain but has less impact on your output distortion touch dynamics and output stage distortion than the phase inverter. 12AU7 19 12AV7 41 12AY7 45 12AT7 60 5751 70 12AX7 100 So you can see that the 12AY7 is a lower gain tube. I have a Mesa Triple Rec, If I were to put a 12AU7 in the V1-2-3 positions, which are the preamp slots. Old tubes may result in lacking lows or highs. Page - 6 12AU7 12AU7 is a miniature 9-pin medium-gain dual triode vacuum tube. With the change, I was able to feed it with tubes from 12ax7 & 5751 family!!! Plug a tube, adjust bios on both channels and you have a great working amp. I don’t have a clue why the Sphinx sounds as good as it does. The C70 KT-88 Vacuum Tube Stereo Ampli7er Bob Cordell 1. Now just curious about the V2 function. I usually prefer 12AU7, or 6CG7, or 6SN7 and I don't think more modern type numbers such as 6922 can sing as well as the best of the NOS 12AU7 where they test well for noise and microphony. UTC A-11 12AU7 ECC82 E D P1 G1 K1 P2 G2 K1 E D P1 G1 K1 P2 G2 K1 J J H G 464 976 200k 22k. The V2 employs Shuguang 12AU7 tube. Since the 12AU7 is quite large, is there a sub-miniature version available? Also: the main difference between the European ECC82 and the American 12AU7 is the heater voltage of either 6. You end up with lower gain from the tube, but otherwise things 'just work' more or less, but not here. A headphone amplifier with outstanding sound quality can be built using readily available modern components. . Excellent detail, warm and bluesy, they sound amazing at the front end of your lower gain guitar amps, and in the "clean" channel of channel switching amplifiers. I am being told by some people that this is a clean swap (from a 12ax7 to a 12au7, 12a The V100 preamp utilized a single 12AX7. The lamp itself is probably not bad (and that is why, careful, I note still "correct") and I do not doubt it to be the case in other circumstances, but I much prefer her Groove Tube, Ruby or DD. Pictures tell the story. Replaced an oooooold GE 12AT7 with this 12AU7 in the V1 position a Fender Pro Junior and was very impressed by how much meatier my tone became. For strictly taming the clean channel I'd get a 5751 or 12AU7 for V1. It will “work” in most of the same circuits, but this tube prefers some circuit tweaks to optimize its performance, and usually just doesn’t sound very good in V1. You should hear a lot of difference normally when you changed v2. V1: JJ ECC83, V2: Tung Sol 12AX7, V3/4 JJ EL84 (matched pair), V5: 5Y3 I realize that this thread is a little old, but my M11 small chassis calls for a 12ax7 and a 12au7. 12AU7 will be in between 12AT7 and 12AU7. I use mine in a  Hey all, I am thinking about swapping out the V1 12AX7 in my Hot Rod Deville for a 12AY7 in order to get a bit more play on the volume knob. Not bad for reverb drivers or phase inverters, but I've never heard one sound good in V1 or V2. We recommend to use high quality tubes here. Switching the regulator tubes will alter the plate voltage on V1,2,3. It was funny to see $200 tube in a $50 amp, but sound it was able to produce was superb. 12AU7 tubes have much lower gain than 12AX7, well, I tried ALL my 12AU7 tubes on the V1 position and the Phono preamp gain didn't seem to change, they made it sound different The tonal characteristics I outlined above will be most apparent in V1. Gold Lion ECC83 / 12AX7 - Let's face it NOS 12AX7's are getting scarce. On the other hand it delivered among the fullest and fattest tone that I´ve ever heard! I´m going to replace the tube in V1 (works only on clean channel I belive) in my Laney VC30 with something lower gain. Scott Stereomaster products include tuners, amplifers, speakers. New Old Stock White Box. For V1 choose the tube the best meets your tonal goals. 12AU7 (ECC82) Vacuum Tubes / Valves There's one in my buddy's V-4 and his tones are awesome through his V-4B cab, yes the folded horn 2x15. 6k r9 3k r10 1 2 3 4 5 6 There are enough 12ax7 and 12au7 tubes made by telefunken to replace all in the C20. And I have line up all 4 models for a comparison. The V1 position on the 834P board is the first gain stage. Excellent substitute for 12au7. another quick update and the best one yet! when i was tube rolling i tried the brimars and the rca vt231 together. The 12AU7 is usually operated at plate voltages of over 120 volts, but fortunately it can be operated at lower voltages with decent results. hp = Heptode Unit. I have done some experiments putting it in V1 or V2 of various Fender tube amps (Twin / Super / Deluxe / Princeton Reverbs). 12AU7 will have good tone, but probably lower the gain WAY too much to be useful. The 12AX7 family of dual-triod preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. RCA and Sylvania first introduced the 12AX7 to the world in the late 1940’s. Voodoo Amps™ carries a variety of tubes to meet your needs. Whisper Tube v1. " I have a Fender Hot Rod Deluxe and want to decrease the gain on the preamp tubes to give more head room. Schiit Magni 3 Headphone Amp and Preamp I have in choosing this model over the V1 is 12AX7 is a high gain tube often used in the first stages of tube amps. When I have tried them in V1 and/or V2, they do tame the pe-amp a small amount, but to me, they seem to neuter the pre-amp a little bit too. And the best I have heard are the new new stock TJ Full Music ax7 and au7. I did many many tries with ECC83WA tubes (little less gain then 12ax7), 5751 tubes (70% gain of 12ax7), 12at7 tubes (60% gain), 12ay7 (45%) and 12au7 tubes (20% gain). The power amp is simply a single-ended Class A design using a 12AU7 tube with both triodes strapped together (paralleled) feeding an $18 ClassicTone 25K to 8 Ohm reverb transformer rated at 3. The spartan manual states that the (3) tubes are 12AX7s. So I feel that Eastern Europe is well represented. It belongs to a large family of dual triode vacuum tubes which share the same pinout (RETMA 9A). The Sphinx is equipped with three line inputs, a phono input and a headphone jack. Añadir al carrito Ver  The 12AT7 is a miniature, high-mu twin triode designed for use as a grounded- grid radio-frequency amplifier or as a combined oscillator and mixer at . 98 Buy Bravo Audio Ocean Mini Valve Class A 12AU7 Tube Headphone Amplifier Discount for cheap 12au7: mini focus for women long antistatic e5333 e5306 e5303 e5353 e5363 of yonex cell character inkjet hp21 mks gen. It sounds wonderful. I've heard great things about the long plate JJECC802S 12AU7 as a power tube so give it some consideration. This combo has an extended clean range, but also has some clipping available from the output stage should you need it. V1: JJ ECC83, V2: Tung Sol 12AX7, V3/4 JJ EL84 (matched pair), V5: 5Y3 * This tube must be a NOS 6201 NOT a new production ECC81/12AT7 in amps up   11% bought TAD JJ 12AU7/ECC82 Tube, €10. Cheap class a headphone amplifier, Buy Quality headphone amplifier directly from China headphone amplifier class a Suppliers: Bravo Audio V2 Valve Class A 12AU7 Tube Headphone Amplifier Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. Amperex - I think the bugleboys are a bit better,but I might be fooling myself, so these comments apply to any Holland made Amperex 12AU7. 022uf C17. Hey all, I am thinking about swapping out the V1 12AX7 in my Hot Rod Deville for a 12AY7 in order to get a bit more play on the volume knob. High reject rate means this was over 75%. It is a very clear sound no noise. I replaced these. One of my bass amp'sAmpeg Svt 3-pro has one of these in the preamp, 1 12au7 and 4 12ax7's, I bot new tubes from Eurotubes and the guy told me it was a low gain tube. Both V1 & V2 are very similar in design, features & functions. Preamp Tubes – 12AU7 / ECC82 / CV4003 / 5814 Tube Basics and FAQ. Tube tests as new with phono/V1 grade noise levels. 2w per unit, at 1. Besides running his blueberry farm in the rural Pocano mountains of Pennsylvania, Bill also heads up Both triodes of the V1 12AY7 are used as gain stages. Of course, that might be exactly what you'd like to do. As Fritz says the reverb driver is not a good place for a 5751. An Electro Harmonix 12AU7 in in the power tube position (V1). Because of the high gain, 12AX7 in V1 has a lot of effect on sonics. The design of this amp includes a cathode follower stage which is split between V1 and V2 so dropping that 12au7 in V2 really interferes with the proper operation of the cathode follower. So this morning I figured I better put up or shut up. The beauty of the Aikido is the drive stage (V1) drives an easy load (V2) and can be adjusted with two resistors (at the cathodes of the V1 valves). The ECC82/12AU7 is well suited to this job because it is cheap and plentiful, its low internal anode resistance allows it to deliver relatively large signal swings into heavy loads, and its moderate transconductance will guarentee fairly low output impedance which ensures wide bandwidth. Fig 4 allows measurement of Ra, µ, gm and noise generation of any small signal triode. You might also discover that you don't have nearly as much volume as you'd like to have, though I think you still would get some good compression. 1950's GE JG 12AX7 Long Plate tested and noise tested. I have A/B'd the 12AX7 and 12AT7 and didn't notice a ton of difference in cleaning it up so I was thinking of a 12AU7. Our racks are based on the original burn-in racks used by tube manufacturers decades past. The Phillips *SQ* is clean, quiet, open, detailed with a nice touch of warmth. -V2, middle small tube. I have not applied power and assume the old capacitors require replacement. “I can’t remember who, but some here recommended that I try out a Raytheon 12AX7A in my V1 instead of the RCA I have in there. It sits next to a 1968 JMI TB retrofit and they complement each other quite well. At V1, the gai n of the 5879 is lower than an EF86 or EF184, therefore the amp won't get into really ripping distorted terr itory with the tone stack engaged. Also Russian. The present combination (mentioned earlier) has bloomed into a beautiful sound. The two stereo channels each use half of the tube. 12AU7 is also known in Europe under its Mullard–Philips tube designation ECC82. $119. These amps seem to be very similar in design looking almost identical to one another except for the difference in two caps at the front portion of the amp. hx = Hexode Unit. 12AU7 = Has 17% of the gain of a 12AX7. This socket and the 12AU7 socket are the two that I will be trying all the different flavours of tubes in. With a 12au7 in V1, you'll get lucky to get any breakup in the overdrive channel, if I'm not mistaken. V1: GT-12AX7 V2: GT-12AX7 V3: 12AT7 / ECC81 Mullard Power Tubes: Ruby 6L6 I was going to return to the 5751s in V1 and V2 but decided to give the GT-12AT7 a try. There are no accompanying manuals/notes. 12AU7 (ECC82) Vacuum Tubes / Valves Using a tube with a lower gain value in V1 can have a big effect on how the power amp reacts to the signal. Using a 12AT7 in place of a 12AX7 in V1 can make the amplifier quieter and give it more extended clean headroom before breakup. In many cases, these tubes are interchangeable  16 Jul 2018 Some players find that a 12AT7 yields a slightly dull, cold tone when used in the V1 position, but that conclusion seems to vary from amp to amp  23 Jul 2019 If you've already tried a 5751 or a 12AY7 in your V1 position, however, and you feel the output stage is still being driven a little too hard at your  If you want to smooth out the volume, try a 5751 (which is really just a 12AX7 with gain similar to a 12AT7) or a 12AY7 in V1. Click here to buy complete sets of tubes for your Z amps from The Tube Store. Military version. A 12AY7 or 12AU7 can be interesting in V3 for example I put a 12AU7 in there & got a great clean tone, but a 'really pants' overdrive tone. Last Edit: Nov 1, 2010 23:17:34 GMT -7 by Scott The tube headphone amplifier in figure 1 is a high current mu follower, with a 12AU7 cathode follower driven by a 6CG7. 1 2 3 4 5 a b c d e f g h 1 2 3 4 5 a b c d e f g h lrck data sck ic1 tda1543 2sc1815 tr4 gnd 2sc1815 tr5 gnd 0. V1: The 12au7 did a dramatically decrease in gain but it colors the tone in a way I don't like. I use it and like it for Grado, Sennheiser, and Sony headphones. 5k r5 1. I was about to sell the TD-1 because it made my bass sound kind of boomy too much low bass. 3V or 12. At any rate, the bad 12AU7 was introduced to the garbage can, and the good one was set aside to serve in a component requiring its services. At long last: the Aikido Phono Preamp . 03 here. wow the sound is so clear The JJ Electronic 12AU7 / ECC82 is a medium gain dual triode built with the quality and reliability that we’ve come to expect from a JJ tube. The amount of healthy blue glow is not an indicator of an issue so long as it is fluorescence we are talking about. The 12AU7 in V1 reduced the gain too much for my liking, but tonally it was a very great, classic rock sound. anyone tried this? i recently bought a Vox AC30 CC head that sounded so bad!!! it was totally pedals unfriendly and the sound was just the sound of a Line6 to me. Either amp had just volume, bass and treble controls. Several years ago I needed a vacuum tube amplifier to compare with solid state designs for use in lis - The clarity in the vocal presentations are excellent at this price point and makes the FiiO E9/E7 sq sound positively grainy and arid. Seems popular with the DIY guys in 1W push/pull setups. I have an Electro-Harmonix 12AY7 in V1, Tung Sol 12AX7 in V2 and an EH 12AU7 in V3. Tube Testing The 12AU7 and its variants are a miniature nine-pin (B9A base) medium-gain dual triode vacuum tube. Didn't see what the 12AT7 puts out, but I'm guessing they use the 12AU7 for a reason. Tube amps use multiple tubes, and the first position is referred to as V1. Hard to find these with the D-Battery holder intact (most all are heavily corroded due to a battery left in for 40 years). I use this tube in the V1 position of an Orange Tiny Terror and it works great for clean and crunch sounds. Please be aware that this tube has 2-3 db more gain than typical 12au7! In addition, it is about 50% taller and draws 0. V1 6C4 AF Oscillator V2a 1/2-12AU7 RF Oscillator V2b 1/2-12AU7 Buffer Follower Notes: * No ‘V’ designations given in manual on these models. Placing a 12AY7 in v1 will lower the front-end gain, no doubt, but your amp will still be making the same 15-ish watts at the point when the tubes start to grind. Start by swapping around your 12AX7 tubes, namely V1 and V2 and see if there is any change. If the amp uses a 12AT7 or 12AU7 in that spot the 5751 is not good choice, even though it may work. The only concern with that tube used in a 12AX7 circuit design is Cathode Currant draw, which is higher on a 12AU7 . I need some help from the "Tube Amp Masters. pin 4 and 5 of the tube (filaments) are connected. 5k r7 3k r8 5. Wanted idle Ea and Iadc is adjusted by VR1 and VR2. 5AR4 / GZ34. I like the pre-amp crunch in my 2266C. 3w. I found that if I put the 12au7 in V1, which is where I would think that tube ought to go--and how the chassis is marked, I get tons of nasty distortion. The phono section is a MM/MC type for high-output cartridges. The (3) tubes are stock & bear the logo of EAR. The amp was built in January 2003. I would not use it for a PI tube, but for V1 and V2, it should be fine, but very low gain. V1 - Tung-Sol 12AU7 "has a gain factor of 20%, this reducers the gain in both channels" V2 - JJ ECC803S “for some dirt in the top end” (this is now a Tung-Sol 12AX7 - sounds better) “Channel 2” For simplicity, the two triodes are usually the same type, but they do not have to be. Marshall's are sold as higher gain amps. V1 and V2 are the input gain stages, V3 is the effects loop and V4 the phase invertor. It's commonly used as the phase inverter in some hi-fi amps, Ampeg and Fender amps. I popped a 12AT7 into V1 and the amp did get quieter but there was a rattle. The amplifier uses 2x2 parallel switched valves. 12AX7 Family Tube Substitution. I'm in no hurry to try it. Our goal is sonic excellence and a perfect sound experience for every single user. 12ay7 has a max design center plate voltage of 300 a little less that the 12ax7 330, but its max plat dissipation is larger than the 12ax7 1. The 12AU7’s have the ball and are trying to get into the red zone. I have an RCA 7025 and I had a Philips Holland 12AX7 in the V1 of my V-4 before it went bad, I liked the Philips Holland more than the RCA but in general I think European tubes have smoother distortion than American. Put the 12AX7 back in V1 and the brand new 12AT7 in V2. Rogue employs a matched pair of 12AU7 tubes for the input stage. Watch for the very rare long plate versions from the s available in most European brands. last note: switching 12AU7 in V2 (instead of V1) and 12AX7 in V1 (instead of V2) just make no difference in having two 12AX7, the output gets a little lower, but the overall drive of the amp and the linearity of the output are exactly the same, so in my opinion it's a useless choice. Not only does it improve your tone, it also improves performance & reliability. I had a new Sovtek 12AX7 in my stash and put it into the V1 socket. Both sections of each tube are paralleled to minimize noise. I don't like the ECC83-S in my particular amp. Re: 12AU7 in V1 of Hot Rod Deluxe III Well, for 12AU7’s I found a JJ (Slovak Republic), and a new-production Mullard, which is a New Sensor Brand, made in Russia. So far I've tried Svetlana Winged C 12AX7s and Mullard 12AU7S. WOW noticed the 3-D sound they were talking about. I'm very fond of a nice little NOS GE 7025 in that position. I think the difference in the caps makes The V1 be able to work with the Electro Harmonix 6922 and the Shu Guang 12AU7 tube with the V2. Because use 12AU7 vacuum tubes The purpose of this new thread. I installed a good JJ 12DW7 - this tube is a 12AX7 on one side and a 12AU7 on the other side. Preamp tubes are also used to create push-pull signal to drive the output power tubes. The 12AU7 is so quiet that it's not worth bothering with--unless you want a low-volume practice amp that only plays clean. You’ll notice that the amp gets looser and with less attack. Check out the following tube reviews for guidance in getting the best possible tone out of your tube gear. 1u c3 1. Much lower gain than a 12at7. Going to get a few more for my other amps. com. These are labelled "Electronics for Medicine" and have the snakes logo of the medical profession. For owners or players considering the EHV Stealth I threw a JJ 12A U 7 in V1 recently just for kicks to see what it would do. 5751 vs 12ay7 vs 12au7 Late last summer I was invited to a cookout at the home of an audio buddy of mine, Bill Magerman. These are all pin compatable with one another, the only differences being the gain factor of each tube. The 12AU7 side is I was thinking of the 12AX7 for the input stages V1, V3, V5, V7 but I am not sure what to use for the output tubes V2, V4, V6, V8. A few months ago, I got myself an EAR 834P w/ the volume pot. a 12au7 as first triode and a 12ax7 as second Can you help me better understand that??? I do not recall seeing a 'gain factor' listed for any of these tubes!!!!! Those are data wise normal ECC83/12AX7 V1 ended up making the clean too quiet, V3 lowered the overall volume too much. It is def. If I turn it up to a volume commensurate with the 12ax7 on 5, which is about 9 with the 12au7, the amp begins to break up. I want to tube roll, so I have some NOS Matsushita 12AX7s. I have listening to it since mid June and I have to say that I like it a lot. These “cleartops” are currently the hottest selling 12AU7, and are still a great buy at current prices. The included tubes are of decent quality and can be expected to provide years of great sound. It sounds great and is especially good for guitar amps because of its rugged construction. My favorite combination for clean playing was a 12AV7 in V1 and a 12AT7 in V3. I've not had a single problem with it, it sounds great. Vacuum Tube Warranty & Return Policy. when unmodded just CUT this connection between pin 4 and 5 and this WILL cure the crosstalk just as oohms suggested in the picture above. Summary of the Preamp Circuit - Each channel used one half of the same 12AU7 (V1) as the first gain stage. 2A3 6CA7 6CA7-Z 6SL7 6SN7 12AT7-T 12AU7 12AU7-T 12AX7-LS 12AX7-T 211-T 211TII 274B 300B 300B-T 845-T 845TII ACME845 Cary 805AE Cary SLP-05 CV181-T CV181-Z EL34 EL34PH emission KT88 KT88-T KT88-Z / KT88-T/TII KT120 KT120-Z packaging Psvane psvane 845T Psvane HiFi Series tubes Psvane T-series psvane teflon caps quad RMA shipping Testing in China I think I found the answer about the 12AU7 in some tube forums- while the "gain" is low, it dissipates around 2. Without the change, the amp would only accept tubes from 12au7 family. We sell TTE tubes in a convenient tested/matched trio for lowest noise and transparent tone. You're welcome to try other brands for 12AX7 replacement but you may get shrill highs or excessive mids on both the guitar sound and on the delay sound. Preamp tubes fill many roles in various equipments. The 12AX7 Black Plate Review, USA tubes as good as Mullard & Telefunken "The earlier a signal is in the audio chain, the more important it's amplification is. High mu valves tend to be less suited to the lower section since they tend not to operate reliably at low anode voltages. Awesome tube for V1 Review by David S. The Raytheon sound has a hint of darkness added to the detail. (apparently the problems with the vox (and el84) tubes For purpose of the headphone amplifier the 12AU7 tube will be used in a common cathode configuration, and the incoming signal will be amplified by approximately 10dB. I would avoid the JJ ECC83S. In V2, with a standard ECC83 in V1, it has a really nice classic rock tone, but it loses its punch - you must run an overdrive pedal to get it cooking. I see the 12AU7 and the 12AT7. Thats why you see triodes such as a 12AT7/12AU7 or even power pentodes like a 6K6/6V6/6W6 in that application. Just did this in my Peavey Classic 30 and I'm loving it so far. Tube Depot carries a selection of 12AX7 / ECC83 / 7025 / CV4004 Pre Amp Vacuum Tubes. J J Electronic ECC802S Gold Pin - 12AU7 Factory Data Sheet: ECC802S Our observations: Another 12AU7 variant from JJ which is a Long plate Gold Pin version of the ECC82 tube. So, here is my question. So I recorded a new rhythm and Lead Track to a song of mine called Awkward Moments shenzhenaudio. triode. It has short gray plates and a halo getter. 5w per unit. 00) works best. Lot more headroom and bottom end on the clean channel, the OD had crunch to sweeping gain with a more pronounced EQ and presence response. I have the schematic that I downloaded from the Fender website, but it doesn't tell me which tubes go to what. A 12AU7 input tube serving as a voltage amplifier, directly coupled to a 6080 power tube as a cathode follower output. That favored Sylvania dominant front line of the 12AU7’s is having a tough time in the red zone with those big RCA’s up front for the 12AX7’s. 12AU7 Holland made tubes (same factory as the Bugleboy) produced and screened for critical use in medical equipment. This will be the position most revealing of noisy tubes. This is true in some cases but not in all cases. I also have 5751's. So stick to the 12AX7, 5751, and 12AY7 for your preamp. 5 watts where the 12AX7 dissipates around 0. Download lagu Tube 12ax7 Vs 12au7 mp3 - dapat kamu download secara gratis di Mrlagu, Dengarkan dan Unduh musik Tube 12ax7 Vs 12au7 tanpa bayar dan tanpa iklan yang menganggu. Agree, it's always been difficult to characterize because it has features that are both analog and digital in nature. Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming supply of current production options to choose from. The original owner wanted as much headroom as possible and wanted to be able to turn the drive up higher without it breaking up and he put a 12AU7 in V1 for the two gain stages and a 12AT7 in 260V. Introduction Those who know me may be surprised to see an article on a vacuum tube amplifier written by me. this tube is a 12AX7 on one side and a 12AU7 on the other side. pentode. Tips: If you pulled the V1 12AX7 tube you may use it as V6 phase inverter. It really suits me that it is a bit darker overall than the Tung-Sol I had in V1. I even tried a Mullard 10M 12ax7 but thought the Tung Sol was about as good. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more! This item Bravo Audio V2 Class A 12AU7 Tube Multi-Hybrid Headphone Amplifier. The V2,V3 preamp tubes are Tung-sol 12AU7 and the power tubes are Tung-sol EL34B. The carrier oscillator at 435 kHz is modulated and filtered using a crystal filter. The output/power tube is a Chinese 12AU7. S1a+b select the dc feed RL to each V1 anode. 12AX7 as phase inverer tube will give the most effect out of this mod. A 12AU7 is a currant source device, that is it will drive a signal very well with little or no increase in amplitude or gain, that is why you like it in the V1 position. Many of us think that V1 (the first gain stage) is the most important tube in an amp. Suggestion- use a 5751 in v1, 12ax7 in v2 and 12au7 in v3. 12ay7 should do it, the 12au7 wont give the gain you might expect, that style of tone stack has a -10 loss. I want to go with 12AY7 or 12AU7 tube, but not sure which ones to change. This represents a huge gain factor change from 100 on the 12AX7 to 60 on the 12AT7. Very pleased. Moonlight Chameleon Adam Alpern Sheet 1 of 1 Moonlight + 12AU7 output tube option 1/1/2002 8 4 SPDT 12AU7 or 12BH7 V3B 6SN7 C14. While this and other similar tubes are meant to operate at plate voltages of 90 volts or more, the 12AU7 performs amazingly well in the current application at only 12 volts. I found the Mullards to be really disappointing with a closed in muffled sound. That makes this a good deal! Doesnt take away or add anything to my E83CC V1. p = Pentode Unit. The 12AU7 is designed to deliver buckets of current, not a beautiful preamplified signal. The Tung-sol sounded totally different in V1 then the OEM tubes. 10 Feb 2019 Vacuum Tube - 12AU7, China - 9 pin miniature preamp tube Im planning to put this tube in socket V1 instead of Sovtek 12AX7WB. Are you looking for the very best tubes for your vacuum tube amplifier? This is the place to start. This flash is normal. ). I bought a Blackheart Handsome Devil head and two cabinets this weekend on Craigslist. Basically, you could turn the volume knob to 3. I’ll be honest. The result is a very quiet amp (noise floor is way down) that you can crank up the volume and get a very nice clean I have tried a 12au7 in V2,( with a 12ax7 in V1 and V4), and it takes away most of the crunch, which is not what I wanted. If you really want to  This 12AU7 offers smooth tones and clear definition which is why it's no surprise that this tube I wanted to try this 12AU7 in V1 just to see what it sounded like. It is also normal for the intensity of the flash to vary from tube to tube, and the flash intensity may also vary or even go away as the tubes age. Today I substituted the JJ 12AT7 in the preamp for the Tung-sol 12AX7 preamp tubes in V1,V4. 6 and 434. 4 x 12AX7 and 1 x 12AU7 tubes, I have to say that my favourite tube in the V1 is a NOS Telefunken 12AU7 (even though technically in the V1 it should have a 12AX7A (7025) or similar). com: Only US$67. I have switched around a lot between various ax7's. Z Amps. However, when I put the Svetlana's into V2 & V3 and used the old chinese 12AX7s in V1 & V2 I got a really nice sound, open, smooth and detailed. I would stick with this but I'm concerned that using a 12AX7 in place of a 12AU7 may harm the amp? So can I ask if it is OK to keep using Svetlana's in this way. There are three crystals in the Mark I filter and five in the Mark III, 432. Right now I have a JJ long plate 12AX7 in V1, a JJ 12AT7 in V2, a JJ 12AU7 in V3, and then a short plate JJ 12AX7 in V4 and PI. The obvious non-answer is good design and carefully chosen if not super-premium parts. Schematic for measuring Ra, µ, gm of small tubes, 12AU7, etc. It’s a zero global feedback, OTL design of pretty high quality. I put this in V1 of my Blackstar HT Soloist 60. I think I found the answer about the 12AU7 in some tube forums- while the "gain" is low, it dissipates around 2. I thought the tube was bad. The basic circuit consists of a dual triode 12AU7. What is NOT normal is a flash from power tubes. I am not sure of which one to use. d = Diode Unit. V1 Tung Sol 12ax7a V2 EH 12ax7a V3 EH 12ax7a V4 EH 12at7 V5 Tung Sol 12ax7a (with a balanced triodes) I don't know exactly which JJ preamp tube you are using, but I find the JJ ECC83-S preamp tubes have a tone more concentrated in the middle, and less clear sounding than either the EH or Tung Sol. Sign-in to My Verizon Fios today! I'm tube rolling my Yaqin MC13s which has two 12AX7s in V1 & V4 and two 12AU7s in V2 & V3. Some schematics on the net add a 2nd preamp or poweramp tube. The first half of the triode is a 12AX7 and the second half is a 12AU7 allowing you to tame some of the gain coming through the amp. The 12AU7 is a low gain tube, having an amplification factor (mu) of only 20. I couldn’t refuse, as Bill is an excellent cook and a man of multiple talents and interests. The above SPICE models for various valves and most of these models are for use with PSpice from Orcad. I've also read where people are saying don't do it. Hi KCA On the phone you recommended the Mullard CV 4024 for me as a switch for a 12AX7 at V1 in my Hot rod deluxe. (2dimensions/no real balls) So i got told to try a 12AT7 in V1 and a 12AU7 in V2. 12au7 may be too much of a reduction Questions about the Bugera 1960 Infinium 150-watt Tube Head? Sweetwater's Sales Engineers are regarded as the most experienced and knowledgeable professionals in the music industry, with extensive music backgrounds and intense training on the latest products and technologies. Preamp tubes take small signal from sources such as guitar pickup, phono cartridge, and even DAC output, and amplify the signal to feed into power amp stage. Most SPICE model links are to Dave Cigna's stash of SPICE models provided by Francesco Piazza- these are marked DC. A 12BH7 can be subsituted for the 12AU7 at V3. Bravo Audio has released the tube headphone amplifiers (V1, V2, V3 & Ocean) for quite a while. Very lightly used and rotated, so plenty of life remaining. In V1 it reduced the gain too much for my liking, but tonally it was a very great, classic rock sound. Typically that tube swap is not a problem. Like all NOS (New Old Stock) RFT preamp tubes, the NOS RFT ECC82 / 12AU7 is a low noise and low microphonic preamp tube. org. Tubes to be tested are plugged into mini 9 pin socket on left side, under S1a and S1b. I tried a "higher gain" 12au7 that Eurotubes had and it made a difference in the SVT, seemed like it had more power afterwards and better grind. The one I have is the Emerald Green-covered Limited Edition from three or four years ago. V5 12AX7 right mag phono amp. 12AY7 Tube Reviews. The All Star Amperex Bugle Boy QB for the 12AU7’s has been running around all day. 6v heater current, twice the typical 12au7. 50 . Since you recommended them if I liked the Brimars, I am interested in purchasing a couple in just a few days here. 15 in series with the signal and 435 as a shunt. 03 for Windows Vista/XP - Features a 12AU7 tube to warm up the sound. I had a JJ 12 AT7 in Vi which sounded really good. I am running EH 12AX7s and 12AT7s and they give more gain than I need for my Dynavector DV10x5 high-output MC phono cartridge -V1 is the first preamp tube, and will have the most effect on tone. Just as I had hoped. Aikido Phono Preamp The above photos are of my own Aikido phono preamp. Photos: Photos taken February 2005. We only recommend using the Shuguang 12AX7B **tubes for V1** and V2 position. Since these came out, they have been one of my favorite choices for V1 tubes. Current tube line up October-2019 Carmen Ghia. The problem is the tube at V3. S. New Old Stock in original and whiteboxes. My current configuration is EI ECC83 in V3 and V2, and a Rogers 12AX7 in V1. 0 replacement new chassis smartphone to desktop Insightful Reviews for 12au7: aircraft female incept 3 parameters big sw a95x r2 smart emf a display display k4 m160 5030 3 propeller g3 a display I love my Fender Hot Rod Deluxe. V4 12AU7 right AF amp. com: Only US$119. RCA and Sylvania first introduced the 12AX7 to the world in the late 1940s. Get the guaranteed best price on Preamp Tubes like the JJ Electronics 12AU7 / ECC82 Preamp Vacuum Tube at Musician's Friend. Schematic for the ENGL Screamer E335 can be download here: the 100u high gain (12ax7) stage, and the "B" triode is the 20u low gain (12au7) stage. V1 is your main gain stage and if that tube is pooched you are going to kill the volume. Get a low price and free shipping on thousands of items. mullardtubes. All of the other 12AX7 tubes and the 12AU7 were made by Electro Harmomix (EH). With the 12AY7, the amp had more clean headroom (breakup was not as early as the 12AX7). But wait, there’s more! Gone too is that honky, boxy quality, and the tiring upper midrange screech that current production tubes are famous for. This 12AU7 offers smooth tones and clear definition which is why it’s no surprise that this tube is often found in hifi equipment as well as guitar amplifiers. The one, the only. This 1960s Toshiba 12AX7 tube was made in Japan and labeled for various companies. If you want to have a little fun, buy 3 JJ ECC803s, and one each Mullard CV4004, Mullard ECC83, Tung Sol 12 AX7. Great sound for a computer setup with a DAC and a decent set of headphones. If you put a lower gain tube in there, you'll screw the tone - it needs to be a very high quality 12AX7 in V1 - for example I'm using a Hamma Vintage in V1 with good results. The 12AU7 responds well with pedals I can get the overdrive I like with the Timmy and with the Cusack more louder clean boost I can make it loud enough to hurt, break windows etc. If this is your first visit, be sure to check out the FAQ by clicking the link above. Find many great new & used options and get the best deals for Bravo Audio V2 Class a 12au7 Tube Multi-hybrid Headphone Amplifier Amp at the best online prices at eBay! As a bass player running these tubes in an Ampeg SVP-PRO preamp. The tubes at V1 & V2 have the same construction and are identical. com sells mullard tubes NOS Mullard Tubes & That's It! NOS NIB Mullard Tubes No Reissues Tube and Bias Info. The 6CG7 is the starting point and the input sound is amplified by 25dB and then the 12AU7 gives you an extra amplification of 30% NOS 12AU7 tubes up for sale. I do need to use quiet tubes because of my speakers being Electrostats. I've run my JAN Phillips 5751 in V1, V2 and V4 Phase Inverter. Now I'm going to order a JJ 12AX7 to try in the V2 position. 98 Buy Bravo Audio V2 Valve Class A 12AU7 Tube Headphone Amplifier The 12AU7 has even lower internal resistance than the 12AT7 and even less gain (20 percent of a 12AX7). " This truism places the 12AX7/ECC83 class at the top of a list for the most important tubes in your amplifier. If the blue channel on the original 5150 III doesn't have enough gain, and the Stealth has too much, this is the perfect middle ground IMHO. This will cause the primary i`ve mostly used 12AU7`s in V1 or V2 in my tube amps pre amp audio section, I would not use a different tube on the phase inverter or loop driver or what ever the Boogie uses the other pre amp tubs for. 99 per tube. We love ’em, don’t we? But to help them really love us back—and I mean with big, juicy, bear-hug love—we need to know a little bit about what makes them tick, how they vary, and what they do for our precious guitar tone. A 12AT7 has a gain factor of 60, meaning it has 40% less gain than a 12AX7. V6 6X5-GT Rectifier. Jip jip, V1 is a design of Kurt Strain and V2 is a design by Saasstad. Some were made for Telefunken. Omitting the output transformer, avoiding overall negative feedback and using good coupling capacitors guarantees a highly linear frequency characteristic, while certain construction methods yield low channel crosstalk. ” Read (source is gone) The Viceroy uses two mixers. V2 12AX7 left mag phono amp. I have gone so far as to put a 12au7 in every position to create a very smooth more jazz to blues sound. Its amplifaction factor puts it between a 6sn7 and 6sl7. I also found a new production Tung Sol 12ax7 works best. I want to make my own valve amplifier, and for that, I'll be using an 12AU7 dual triode tube. I have never noticed a massive difference in the other slots. Is a 12ax7 on 5 essentially a 12au7 on 9? 12AU7 Amperex MEDICAL GRADE, "Electronics for Medicine" original Holland made. they sounded pretty awful! well i didnt realise that swapping them around would bring a massive difference! this weekend i put the brimars in v2 and v3 and i put the rca`s in v1 and v4. Marshall’s first amps almost duplicated the Fender power section and many other manufacturers completely cloned them. Any concerns? The Bottlehead Crack circuit uses two tubes. Then coupling through a capacitor-C1 to a grid pin of 12AU7 vacuum tubes-V1/1, by have a resistor-R1 is setting an input impedance of them, and has VR1 act as resistance of cathode to set bias current of vacuum tubes V1. Right wouldn’t using the 12AU7 side of the 12DW7 for the cathode follower draw a lot more current, dropping the HT supply? i think leaving V2 a 12AX7, then lowering the cathode load resistor on the cathode follower, along with the plate resistor of the driving stage to maybe 68k/68k would give nice results? i put in a 5751 in V1 on my blues jr The 12AU7 is an old fashioned choice of tube because these days the premier makers like to use 6922 / 6DJ8 / ECC88 or the Russian 6H30. In some cases it can be pretty easy to change up an amp's fundamental characteristics, too, just by changing tubes in some crucial positions—and the tube that affects the biggest sonic change in most amps is the one we call "V1" (for "valve number one"), the first preamp tube that your guitar's signal hits after entering the amp's input. Base for this valve is B9A shenzhenaudio. 12AY7 has more gain than 12AU7, might work, but never did for me. this is THE tube to have in the V1 slot on any guitar amp, it has that 1960s sound, excellent breakup, and a smoothness than must be heard to be believed! These are the original 1960s RCA made 12AX7A tubes from the Harrison, NJ USA RCA tube factory. When a player says “I want a Fender clean tone” they say this because it is is one of the most revered clean tones ever built. Brainworx Audio stands for finest audio engineering Made in Germany. The Tung-Sol 12AT7 sits in the PI. If you want less preamp gain out of this tube, insert the V1 tube and use 12au7 or 12at7 in the V2 slot in stead of the standard 12ax7. Utilizing sophisticated circuitry borrowed from our most advanced designs, the Sphinx is able to outperform separates costing far more than this single box design. V1 12AU7 left AF amp. Genelex B759 (long plate ax7) in v2 and a NOS GE in v1. If you are looking to upgrade the tubes in your amp, 12AX7 in V1 where you want to start. 04 7uF 630 V 324k 1740 82k 160k 1k5 2W 118 237k 0. Tubes are V1 = 12AU7 and V2 = 6AL5. Full range, nice extension on top with a great sense of vibrancy, transparency and life with very good focus. The plan is to put a NOS RCA 12AU7 in V1. 12AU7 / 6189W Phiips ECG NOS · 12AU7 / 6189W NOS Buena Calidad y Larga Duración. Mark uses a pair of JJ Electronic 12AU7 tubes in the preamp section and Hypex UCD180 Class D modules for the output stage Source Legend: DC Dave Cigna / Francesco Piazza DM Me!. dual triode family (12AX7, 12AU7, etc. The heater life is rated at 10, hours, and some have gold pins. v1. This will ensure the annoying crosstalk is present in this amp too. The HD is a two 12A_7 preamp tubes and two EL84 power tubes amp. [VST] - Download Whisper Tube v1. 12 user reviews on Tung Sol 12AX7. Bravo has been famous since its release of V1 (6922) & V2 (12AU7) amps, which were budget friendly, yet performing, which won ears of many enthusiasts. Changing the Tone of the Cyber Twin; I installed a JJ 12AU7 in V1 and a Electro Harmonix 12AX7 in V2 and have lots of warm gain without noise and enough tasty V1 is in the dirty stage? V1, 2, 3 and 4 are all for the amp overall, v1 takes the input from your guitar and is the most important tube in any amp, changing anything on that tube will affect the overall sound, of all channels, cleans on your amp should be pretty much the same as before, maybe a little warmer, but the most significant change will be on the drive channel. Do you still have some? I had to tell you that since I have gotten the Siemen EL34's and Mullard 12AX7 in V1 and Brimar in V2 of my Marshall as you recommended, the performance sound and feel of the amp have become simply amazing. I mainly use this 65 watt tube monstrosity for home playing, and can barely get the volume to 2 before the neighbour's giraffe starts to panic. In short, it's staying. The good news? The quality of current production 12AX7's is getting better and better. Use a JJ ECC803S in V2. V2 definitely tamed the gain but it sounded like it was getting compressed very quickly with any loud signal from the guitar - a bit too squishy. I was looking at another tube and you convinced me to try this 4024. What a fantastic tube for a blusy drive sound, and it still produces a fantastic clean sound when not overdriven. Sounds great! I bought a couple of different 12AU7 tubes from The Tube Store and I'm having a great time swapping them in and out of this little guy. So it makes for a very dark and quiet amp. Reverbs need gobs of current to work and the 5751 can't supply it. I have used them as V1 in A Carvin Vintage 16, Marshall TSL122, Mesa Boogie DC-5, Carvin MTS3212, Carvin X-100B, etc. I use the amp solely for its clean channel – we’re Ah, tubes. Great value. (Note that the 12AU7 is not a great substitute in the preamp positions in most guitar amps, even when you really want to tamp things down. 3 uF 400 V Plate-to-line transformer 15K:600 ohm +20 dBm typical 12AX7 ECC83 C B A-A-11-8 UTC A-11 12AU7 ECC82 E P1 G1 K1 P2 K1 E D P1 G1 K1 P2 K1 Stay with these. A 12AX7 has a gain factor of 100. 1uf 500K 22uf 220K 1M-A Dwell. This mod reduces the amp’s clean headroom and you’ll achieve sweet spot at a lower volume. (Posted on 6/28/17) When We play the guitar, micro phone or contact will get sound signal from the electric guitar to J1. 3V ct. I typically set the Bass control low at about 3 and leave it alone and then play with the amp's two volume controls--don't set the Master Volume and Use your My Verizon login to review and pay your bill, sign-in to pay your bill automatically, and see the latest upgrade offers and deals. If you want more preamp gain out of this tube, you should pull V1 to achieve a hotter signal out of the V2 preamp tube. Dangerous voltages normally associated with tube projects are eliminated. Left, view from the front. But I tried something that surprised me, I have several 12AU7 tubes which I use for the V3 tube (buffer, to keep impedance low), I have Raytheons, NECs and one RCA. Would this effectively reduce the overall volume of the amp some, and allow me to push into the power amps a little harder? Reading the linked charts these tubes have 70% less gain than a standard 12AX7. FHR Deluxe Circuit Mods Keep the 12AX7’s in V1& V3, and use a 12AT7 in V2. SUBSCRIPTS FOR MULTI-UNIT TUBES: b = Beam Power Unit. When I substituted a 12au7 - with the volume on 5 - the tone is clean, but the volume is much lower. I feel like I now have more control over my volume and tone with this lower gain 12au7 The real question is your defintion of 'headroom'. ) Hello I have purchased the Bravo Audio Ocean Class A Tube Headphone amp (which I at first thought this thread was all about) and ordered a Psvane 12AU7-T for it before I found this forum. This itself may be a "tainted" test, because you're making sonic judgments about V1 using a ridiculously easy load. You may have to register before you can post: click the register link above to proceed. 8 Jun 2018 The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. The Electro Harmonix 12AY7 is the best sounding in my clean (low gain/stock, aside from the tubes) LNT so far. This Guitar preamp circuit for over drive before to the power amplifier or headphones. Packaged very securely in shipping materials, arrived four days ahead of the earliest expected arrival date. Many European tubes in the 12AU7, 12AT7, and 12AX7 families may flash brightly when you first power up your gear. Similar to 12AU7/ECC82, Grey Plate with ring getter which recreate the balanced tone, deep, tight bass, sweet mids and well-defined highs. V3 6EU7 left and right ceramic phono amp. The reason for doing this was that it was almost impossible to drive the tube (12AU7) into distortion. I've owned the Rogue Sphinx v2 for about a month now - great little amp! I have this paired with Dali Zensor 3 loudspeakers, and sources are a Vinyl Nirvana VN-150 turntable with Ortofon 2M Bronze cart, Marantz CD6005, and a Nakamichi 480 cassette deck. 0047uF V3A 6SN7 C4 47uF/25V R10 340/2W R16 2. At its core PWM is a non-linear analog modulation (similar to FM in that sense) as the width of the pulse within any period of the sawtooth carrier WF represents a continuously variable characteristic of the input waveform - that being the difference between the amplitude of For the ax7's I'm currently running a new prod. It was designed by a guy called Matsumin and then developed further by Beavis Audio. Untuk mendapatkan link download lagu Tube 12ax7 Vs 12au7 yang ingin di simpan di hp dan laptop, dan ikuti link yang muncul dihalaman selanjutnya. Post your comments. Passion drives us to push audio technology forward every day. A quick and easy tube change can make the most dramatic Doesnt take away or add anything to my E83CC V1. V1 & V2 are already telefunken, which I gather is a well regarded brand, while V3 I've been reading that placing a 12AU7 in V1 reduces volume on the HRD. Tube Depot carries a selection of 12AU7 / ECC82 / CV4003 / 5814A Pre Amp Vacuum Tubes. The 12AU7 is a low gain tube with an amplification factor (mu) of only 20. Matched Pairs Fr left: Telefunken Ribbed: \\\0 [2 pairs avai In very good to excellent physical condition. It belongs to a large family of dual triode vacuum tubes that share the same pin out (EIA 9A). 40,00 € Disponible. JJ Electronics ECC823 12AX7/12AU7 The ECC823 JJ Electronic twin triode is a 12AX7/12AU7 Hybrid The JJ 12AX7 ECC823 has been developed by JJ to try and help customers tame some of the gain in their amps. 7K R31 470R 12BH7 16 OHM 8 OHM 4 OHM COMMON MOJO / WRIGHT 1580 OT NOTE: Use 4 Ohm tap if you use a 12AU7. In addition to the special green tolex, it has a Celestion Vintage 30 speaker in it, which I prefer to the stock speaker. worth purchasing from a trusted reseller that has the ability to noise grade the ax7's. It appears that Vox chose this tube for the first position in the AC-50 preamp to keep the preamp gain at low to moderate levels. We value the work of our plugin developers and the creators of the original hardware units we emulate. Dynamic, transparent, and profoundly musical, the Rogue Sphinx sets a new standard in affordable integrated amplifiers. This list is our current tube type, location and bias points for all of the Dr. 022uf 220K 470K 220K 2M R26 68K VOL 500K-A REVERB TANK ACCUTRONICS 4AB3C1B or 4AB2C1B 820 12AX7. If, however, I put the 12au7 in V2 and the 12ax7 in V1, the amp sounds superb. Even more impressive is the fantastic breakup / drive of this tube. It made a huge difference Only 2 tubes stock. I'm also thinking of putting a 12AU7 in PI. 5 - 4 with the 12AX7's and then start to breakup nicely. 12AX7 tubes have an amp factor of 100,12AU7 have an amp factor of 25, if you put 12AU7 tubes on your Phono preamp and the output/sound level doesn't decrease, your Phono preamp is using the tubes as "buffer" and not for amping the Anyone that feels the need to run a 12AU7 in V1 of their Marshall is playing the wrong amplifier. Surprisingly, there is a balance control, which is not often seen in this price range. They sound great, and I've never had one with noise issues. When that happens, the price goes up. I'm not a fan of the Tung Sol, at least in a Fender Hot Rod Deluxe. The SVP-PRO came with a Groove Tube (GT) 12AX7R in the V1 socket which is a Russian 7025 (Low Noise) tube made for GT. A 12AU7 resul ts in a mostly clean, very warm sounding tone. I doubt there is a better tube in this pricerange. A moderate reject rate means that the QA variance was more than a 50% spread from low to high factors in either plate current, TC or gain. I like it in the Phase Inverter slot a lot. A Comparison of Current Production 12AX7 Tubes by Kurt Prange. HHScott reference for fans of vintage vacuum tube Scott consumer hi-if components from 1946 to 1966. The Ocean, of course, sports the 12AU7 tube and if one remembers Don’s review on the V1 and V2 he felt this was the superior tube if mids and vocal are important to you. Man, am I impressed!!!” Read ” As a class of tubes, the black plate Raytheon are truly superb–equal to the best of the RCA. Hi All Well I've been raving about the new 12AU7 tubes in my Cyber Twin SE amp. The Valve Caster is a boost and overdrive designed to use a 12AU7 valve and run from a 9v battery (but I've found it sounds best running on 12v). The Mullard 12AU7 arrived today. Bravo V2 & Ocean These 2 little amps, V2 and Ocean are using Shuguang 12AX7 tube. You can also try 12au7 for a much more obvious change. 6V. Its all fun stuff this Get the guaranteed best price on Preamp Tubes like the Tung-Sol 12AX7 Tube at Musician's Friend. New & NOS tubes from Tung-Sol, Electro-Harmonix, JJ & more! Swapped 12AY7 (GT) tube into V1 (in place of the stock 12AX7). Asked by  A Blues Junior with a 12AY7 in V1 will produce just as loud a clean tone as one with a 12AX7, but at 7 on the volume knob, while the 12AX7 will produce  21 Sep 2019 Then coupling through a capacitor-C1 to a grid pin of 12AU7 vacuum tubes-V1/1, by have a resistor-R1 is setting an input impedance of them,  Replaced an oooooold GE 12AT7 with this 12AU7 in the V1 position a Fender Pro Junior and was very impressed by how much meatier my tone became. My first experience with NOS. 12AU7 Amperex MEDICAL GRADE, "Electronics for Medicine" original Holland made. Phowell1, this is the route I would take if you plan to change tubes BustedGear. 022uf. i had the brimars in v1 and v4 and the rca`s in v2 and v3 on my amp. The Forum for High End Audio. These RFT ECC82 tubes were made in Germany during the 1960’s. 5 watts as the output transformer. 2 pcs (One Matched Pair) PHILIPS JAN 5963 Audio tubes. I have been rolling tubes in and out of my 834P for ten years and have seen no improvement using any other type, in particular the most frequently recommended alternatives, a 5751 in V1, and a 12AU7/ECC82 in V3. Grading and Matching. This combination is overly bright and the gain is very gritty. The Orange is signifigantly darker in tone with a rather tight low end. Fender amps reside in studios all over the planet and here in the ET studio its no exception. These GE 12AX7 long plates are my favorite tube of choice for V1 of most guitar amps. 12ay7 / 6072 12AY7's will allow for a cleaner tone and a bigger sweep of the gain and volume controls on your amp. Made in USA . 12AU7 16 OHM 8 OHM 4 OHM COMMON MOJO 1580 OT V1 V2. See user reviews. Use either a JJ ECC803S or Tung Sol 12AX7 in V3 and V4. 001uf 100K 4. I have found that a new old stock RCA 12au7 ($20. Cryogenic Treating. Just wondering if anyone else has had success with using a 12AU7 in V1. 2 2 uF 200 V 22k 1K5 2W 18k 5W 33 uF 450V 22 uF 450V 3. 12au7 in v1

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