This 12au7 is a favorite amongst our customers and sold in greenyellow amperex boxes. Everything you need to know about 12ax7 tubes tubes for amps. Tube rolling 12au75814 family tubes talkin tubes the. The tube driver doesnt really use the tubes for gain. I rolled a number of tubes from the 12au7 family in this unit. Je me suis tourne ensuite sur des pedales incorporant une lampe 12ax7.
Jan 10, 2018 12at7, 12ay7, 12au7 instead of a 12ax7 might tone it down. I need somebody to either explain or steer me to an explanation of the 12ax7 12at7 tube s purpose in my jolida jd502p power amp. Nov 08, 2012 im writing to let you know that i have received the psvane 12au7t grade a tubes. Nov 11, 2016 a demostration of tone and volume differences between 12ax7 and 12au7 ecc82 preamp tubes in v1 position. Psvane 12au7t grade a vs nos telefunken 12au7 psvane. If you want to experiment with something in between, you could try a 12at7 there, but i havent tried it in my 3pro, so its up to you. Bk butler tube driver with 12at7 philips usa nos tube. The only other problem i have had is getting it to cut through in a band situation. Compatible with all electric guitars and amplifiers. Pedals with separate ac power supplies or wall warts are not original and do not. The 5814a is a militaryindustrial grade 12au7 with low noise and highreliability spec.
It can be a little harsh and raspy and i assume that is because i still have a 12ax7 in it. Any experience with an original bk butler tube driver. Its like changing the types of tubes anywhere from a weak 12au7 to a blistering 12at7. The 12ax7, 12at7, and 12au7 all belong to the same family of nine contact, twin triode tubes. What other items do customers buy after viewing this item. To add gain, you can substitute a 12at7 tube, which will give more distortion and beefs up the mid range frequencies.
Will these work can you replace a 12ay7 or 12au7 with a 12ax7 and will they be good replacements for the stock tubes. To have a cleaner, more vintage sound, you can substitute a 12au7 tube, which will clean up the tone and thins out the midrange. What types of tubes can be considered as compatible with 12au7. The first lick is with the 12ax7 and the second one with the 12au7. My attempts to put it in the input stages of an amp resulted anda significantlya shrunken sound stage and. For a year plus ive been very happy with a matched pair of cbshytron 5814a tubes. Im not really sure what the tube is doing but i know from putting a 12au7 in mine that the gain didnt really change much at all. I definitely need to try a 12at7 or a 12au7 in mine. I have also tried 12at7 tubes in the 911 and did not hear a big difference vs the 12ax7.
I got a bk butler tube driver several weeks ago and either it just doesnt work with my equipment or ive got a bum one, i was wondering if you guys could help me decide. All 12at7 ecc81 6201 cv4024 12au7 ecc82 cv4003 5814 12ax7 ecc83 cv4004 5751 6922 6dj8 7308 pcc88 6sl7. Tube testing equipment why we dont sell certain brands filter by all 12at7 ecc81 6201 cv4024 12au7 ecc82 cv4003 5814 12ax7 ecc83 cv4004 5751 6922 6dj8 7308 pcc88 6sl7 5691 cv1985 6n9 6sn7 5692 cv1988 6n8 hide price misc. Im comparing it to a brand new nos telefunken 12au7. You might prefer a 12au7 valve in your pedal rather than the 12ax7 if that lower. Bk butler tube driver 12au7 tube rolling the gear page.
In many cases, these tubes are interchangeable and can easily be swapped. Testing 12ax7 vs 12au7a preamp tube in marshall jcm 2000 dsl 50. The 12at7 is a high mu multipurpose double triode in a 9 pin miniature package. The 5963 has a max plate voltage of 250v while 12au7 has a max of 330v. A very thick, rich overdrive, with the added advantage that one can swap in various tubes for different tonal flavors and gain. What is the tube it is supposed to use according to the schematic. I tried 12ax7s in this pedal including the coveted ei prewar yugo 12ax7 as well as 12at7 s, but i prefer 12au7 s for their lower gain and clarity. Below are most of the commonly known variations of the 12at7. Any 12axx tube is made as a 12ax7, then it is tested and rated as to how much gain it creates. I swapped out the 12ax7 for an nos 5814a military grade 12au7. It is a very widely used tube for phase inverter use in audiophile amps and amps like the ampeg svt bass amp. This vacuum tube retainer for small 12ax7, 12at7 and 12au7 tubes is only necessary if tubes are mounted where vibration may cause them to work out of the socket, but if needed do provide a hold down for loose stabbed sockets.
Jun 22, 2006 i want to try more options at the 12au7 position. As well, this tube s low gain make it a great choice for tube preamps in hifi stereo systems. It is unmarked, other than bk written on it with a sharpie. Jan, 2017 ive had a bk butler tube driver for quite a few years, love it. The 12ax7 is by far the best known preamp tube among guitar players. One of the most commonly found driver tubes found in pushpull tube audio power amplifiers is the 12au7 tube. I am on again off again with my bk butler tube driver wbias mod. Our leveling amplifier is one of best guitar effects pedals of the. If you have known brands and they test good you could probably sell them for decent money, especially if you can match them. The 12au7 and its variants are a miniature ninepin b9a base mediumgain dual triode vacuum tube.
This tube has a specially designed cathode which can withstand long periods of time in cutoff without hurting the tube. Obviously a lot more can be said about the effect each tube type has on tone but the best thing to do is have a listen for yourself and make your own determination on what type you prefer in your amp. I would think it would play nice with just about any amp, since it has a full array of tone and level adjustments. The stock tube that ships with the 911 tube driver made since 2006 is a golden dragon 12ax7 a low noise, hifi preamp tube. The distortion on my first td was a bit too rough at low drive settings for my taste, so i swapped out several different 12au7 tubes. I believe by now, a lot of people know that the psvane ttubes are good. This is a premium version of the 12au7 made only by cbshytron. As with the 4 knob versions, if you want a smoother low gain sound out of the real tube, try changing the stock 12ax7 tube a lower gain tube like a 12au7 or 12at7. I actually got it used on evilbay should have just bought a new one direct from bk. Regarding telefunken, there are ecc802s and ecc82 tubes, the ecc802s is a very expensive lownoise, longlife tube, and quite different from a ecc82. Tubedriver blue, thermionic, mosvalve, butler audio, blue tube, blue tube illumination, appearance. Bk butler tube driver 5knob demo original bias mod vs diy bias mod duration. These are great as far as they go, but they dont provide dirt from the output section of a tube amp the ot and speakers. It is a very widely used tube for phase inverter use in audiophile amps and amps like.
What is the difference between the 12ax7, 12at7, and 12au7. It comes stock with a 12ay7 for the preamp tube and 12au7 for the output driver tube. May 07, 2016 my cary cd player 303300 uses two 12au7 tubes. As has been said they can often be used in place of a 12au7, but they make good driver tubes. I think 5814 is equivalent to 12au7 but again i am not. But im not sure if any one of your customer have done a direct comparison to a brand new nos tube. The bk butler tube driver has a sordid manufacturing history, having been made at. I get preamp tubes in a preamp, but ive found it difficult to find a clear explanation of what the driver and input tubes are actually doing, and their relative importance to the sound of the amp.
I replaced the 12ax7 with a 12au7 jj electronic for an overall warmer tone with more compression and a much wider range from powerful. For the last few days ive rolled in matched pairs of. Apr 27, 2017 testing 12ax7 vs 12au7a preamp tube in marshall jcm 2000 dsl 50. I replaced the original 12ax7 tube with a jj electronics 12au7. Well, my tube books are out of reach, and i dont want to disturb the cat in my lap but i think its because the 12au7 has lower transconductance but can drive a little more current.
Tube driver bias with yugoslavia 12ax7 and tube driver chandler sylvania jan 12au7. Heart of the tube driver is a real handselected 12ax7 tube by bk butler himself. When i set my real tube to sound the same as my 1980s or 2007 tube driver, i can barely hear any difference in a blind sound comparison. Apr 12, 2012 if you put 12at7 in voltage amplification stage of your amp, you willa definitelya here a difference, but the tube has not been designed to be used this way thus, dont do it. Tube 12at7 or rohre 12at7 id3539, double triode, noval, b9a and vhf shown. I have some siemens e82cc which are military grade, but i haven. Chandler tube driver vs tube works 911 telecaster guitar forum. I have a cheap electroharmonix 12au7 in my 5 knob real tube that. The real deal tube driver from the original designer. What tubes would you suggest for upgrading the ones on this unit. I got a tube drive for christmas, and in 20 years of playing guitar ive never.
Nos mullard 12au7 mij sq squier strat solid state harmony student model no. We will take a look at why you might, or might not want to swap out the different types of tubes. I have a bk butler tube driver with the bias control. Can be combined with silicon rings to reduce vibration noises. Bk butler tube driver page 1 joes guitars, amps and gear. Tube driver original by bk butler with bias control. The amperex 12au7 is a nos 12au7 that is made in usa. It belongs to a large family of dual triode vacuum tubes which share the same pinout retma 9a. This tube has very low noise characteristics and heavily plated gold pins. Tube drive and distortion pedals function much like a tube preamp, and typically use the same 12ax7ecc83 type tubes, so obviously a.