Difference between 12au7 and 12au7a audiogon discussion. This is a little different than the bk butler tube driver im told. Each side of the tube does a different job in the amp, like two separate tubes. Dual 12au7 regen radio the morning light broadcast. I am interested in trying some tube rolling and have been looking at au7 and ax7. 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. Jan, 2017 yes, had all 3 bk butler, chandler, and the dm overlord. The 12au7 and its variants are a miniature ninepin b9a base mediumgain dual triode vacuum tube. I think the 12au7 is most effective in a feedback application, because it isnt linear. A lot of what ive read frowns on a 12at7 in v1, reserving that tube type typically for the reverb slot. It features controls for out level, eq sometimes split into high and low eq, and tube drive level. I have both a 80s bk garage made tubedriver and his latest reissue. I definitely had higher gain and didnt have to turn the volume knob up on my preamp as i did when i had the 12au7 tubes.
Tube driver original by bk butler with bias control. Compatible with all electric guitars and amplifiers. What other items do customers buy after viewing this item. For a year plus ive been very happy with a matched pair of cbshytron 5814a tubes. It belongs to a large family of dual triode vacuum tubes which share the same pinout retma 9a.
Reviews i read said that the td would sound better smoother less harsh with a 12au7 or 12at7 tube. These are all pin compatable with one another, the only differences being the gain factor of each tube. Steve, could you tell us your ranking of the 12au7s. For use in the phase inverter position, we recommend the triode matched option. It is unmarked, other than bk written on it with a sharpie. The first, original, one was the bk butlerchandler tube driver. I need to stay within the modest budget of skylabs pricing above for these amps. I need two 12au7s, two 12ax7s, and four 6l6s for two dared vp20 mono blocks. The core of the pedal is a handselected 12ax7 tube which gives you a. Chandler tube driver vs tube works 911 discussion in the stomp box started by winny pooh, mar 17, 2006. On the new tube drivers, both david gilmour and eric johnson use ei. This tube has very low noise characteristics and heavily plated gold pins.
The 12at7 is a high mu multipurpose double triode in a 9 pin miniature package. As of 2012 update the 12au7 continued to be manufactured in russia, slovakia jj electronic, and china. From united statescustoms services and international tracking provided. The 12au7, being a slightly lower gain tube than the 12ax7, was slightly smoother and cleaner sounding at low drive settings in my old bkb chandler tds, but there was a less noticable difference in my 911 tube drivers. Double triodes of the 12au7 family have a centertapped filament for use in either 6. For the bias control my favorite settings are maximum for gilmour tones and 10 notches below maximum for my original tones, which is roughly 2. It belongs to a large family of dual triode vacuum tubes which share the same pinout eia 9a, including in particular the very commonly used lowmu 12au7 and highmu 12ax7. My favorite tubes and their substitutes by robert h. The tii series 12au7 remain the same as the tseries except the packaging changes.
I believe by now, a lot of people know that the psvane ttubes are good. Going by steves recommendations i need to look for some mullard or rca 12au7 i think i have 1 of these rca. All 12at7 ecc81 6201 cv4024 12au7 ecc82 cv4003 5814 12ax7 ecc83 cv4004 5751 6922 6dj8 7308 pcc88 6sl7. I currently have os rca black plate 6l6gc with a spare set of nos on hand and i also have 4 good tele 12ax7 on hand. Any 12axx tube is made as a 12ax7, then it is tested and rated as to how much gain it creates. Reverb drivers dissipate lots of power and wear out faster, so we recommend carrying spare as well. Due to the combination of low gridplate capacitance and medium gain, it is suited for use in audio voltage amplifier with an extended frequency range. I also need one 5z4p and two 12at7s for a dared sl 2000a pre amp. The amperex 12au7 is a nos 12au7 that is made in usa. A sample of two tube driver an old chandler with mullard ecc81 vs a new b.
It was 9v powered, like most pedals, making it more marketable to a larger crowd. The 12ax7, 12at7, and 12au7 all belong to the same family of nine contact, twin triode tubes. Hi there, ive now listened and analyzed countless 12au7s and its equivalents and thought id give my opinion on my current favorites. It belongs to a large family of dual triode vacuum tubes which share the same pinout eia 9a, including in particular the very commonly used lowmu 12au7 and highmu 12ax7 the 12at7 has somewhat lower voltage gain than the. What is the difference between the 12ax7, 12at7, and 12au7. Im comparing it to a brand new nos telefunken 12au7. 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. This schematic is for the chandler wall mart version the one that doesnt. Testing 12ax7 vs 12au7a preamp tube in marshall jcm 2000 dsl 50. Butler with siemens ecc82 mjt stratocaster with lollar. This tube is essentially two 6c4s or two ec90s in the same envelope. The chandler tube driver in davidas rig from 19932006 has a slightly warmer tone than the new bk butler model in davidas rig from 2006. Tube depot carries a selection of 12au7 ecc82 cv4003 5814a pre amp vacuum tubes.
This 12au7 is a favorite amongst our customers and sold in greenyellow amperex boxes. Can be combined with silicon rings to reduce vibration noises. Heart of the tube driver is a real handselected 12ax7 tube by bk butler himself controls. Hi andrea, i have the bk butler tube driver with bias mod as well, i use a nos yugo real tube tho 12ax7. The sound also was a little more forward but i had a little more detail. By 1985 butler was using chandler industries to distribute the tube driver. In many cases, these tubes are interchangeable and can easily be swapped.
In most tubes, like the 12ax7, the two sides are identical. What tubes would you suggest for upgrading the ones on this unit. Bk butler tube driver 5knob demo original bias mod vs diy bias. This schematic is for the chandler wall mart version the one that.
You might or might not want to know that the tube driver uses an op amp solid state integrated circuit to create its distortion sound, and the tube is used after the distortion. The added micro tube audio preamp stage is visible near the wafer style power switch. The 2006 bk model is delivered with a 12ax7 tube which is a bit too. Ive done the swap of 12at7 in place of 12au7 and with the tube gear i had the difference was pronounced. But im not sure if any one of your customer have done a direct comparison to a brand new nos tube. The tuning cap for the notch filter was salvaged from a transistor radio. Test of a fender hot rod deluxe with different driver tubes v3. 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. The 12dw7 has two different sides, one with a gain factor of 100 like a 12ax7, and one with a low gain factor of about 20, like a 12au7. What is the tube it is supposed to use according to the schematic. The stock tube that ships with the 911 tube driver made since 2006 is a golden dragon 12ax7 a low noise, hifi preamp tube. This is a suitable replacement for any 5847404a tube type.
The 5963 has a max plate voltage of 250v while 12au7 has a max of 330v. The bias control allows you to adjust the tube characteristics over a wide range. 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. For reverb driver, we recommend smaller plate 12at7 such as electroharmonix 12at7ehwc. Its like changing the types of tubes anywhere from a weak 12au7 to a blistering 12at7. We will take a look at why you might, or might not want to swap out the different types of tubes. Heart of the tube driver is a real handselected 12ax7 tube by bk butler himself.
We also offer low noise option to eliminate potential issues. Chandler tube driver vs tube works 911 telecaster guitar. Chandler tube driver vs tube works 911 telecaster guitar forum. Jan 10, 2018 12at7, 12ay7, 12au7 instead of a 12ax7 might tone it down. And, from my limited experience with the moondogs, it is more linear. This is a premium version of the 12au7 made only by cbshytron. Thats the cool thing about these, you can easily modify them. Each tube wrapped with a cardboard inner liner and pin protector. My attempts to put it in the input stages of an amp resulted anda significantlya shrunken sound stage and. Tube 12at7 or rohre 12at7 id3539, double triode, noval, b9a and vhf shown.
The tube driver doesnt really use the tubes for gain. I have a bk butler tube driver with the bias control. Pedals with separate ac power supplies or wall warts are not original and do. 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. Super popular for vtl, manley, atmasphere, and others. Below are most of the commonly known variations of the 12at7. The a is a slightly more rugged construction which results in lower output microphonics. Im writing to let you know that i have received the psvane 12au7t grade a tubes.
I replaced the 12ax7 with a 12at7 and had a good time. The distortion on my first td was a bit too rough at low drive settings for my taste, so i. Any experience with an original bk butler tube driver. Bk butlers original hand made tube driver guitar pedal used by eric. I love and appreciate tube based audio gear and own sixteen pieces of tube gear between my two reference systems. Mullard cv402412at7 these are in royal air force boxes, made in great britain, and are wonderful. The 12au7, being a slightly lower gain tube than the 12ax7, was slightly smoother and cleaner sounding at low drive settings in my old bkbchandler tds, but. I recall the bk butler having heaps of gain too much imo. 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. Apr 27, 2017 testing 12ax7 vs 12au7a preamp tube in marshall jcm 2000 dsl 50. The first, original, one was the bk butler chandler tube driver. Will these work can you replace a 12ay7 or 12au7 with a 12ax7 and will they be good replacements for the stock tubes. This is the most popular and sought after 12at7 ever. Vintage chandler rack tube driver 12ax7 overdrive rackmount.
Butler tube driver the core circuit design on the 2000s reissue 911 tube driver is similar to the original 198587 versions, but there were several component value changes across the circuit that affect the way it sounds, as well as different pots. For the last few days ive rolled in matched pairs of. Originally posted by ferbose i have a cayin ha1a and which uses 12ax7, 12au7 and two el84. There are many equivalent tubes with different names, some identical, some designed for ruggedness, long life, or other. Nov 08, 2012 im writing to let you know that i have received the psvane 12au7t grade a tubes.
Tube driver bias with yugoslavia 12ax7 and tube driver chandler sylvania jan 12au7. Yes, had all 3 bk butler, chandler, and the dm overlord. The e88cc specs looked more linear and the tube sounds more linear. The chandler tube driver is an overdrive pedal most famously used by eric johnson, david gilmour, billy gibbons and joe satriani. I rolled a number of tubes from the 12au7 family in this unit. The 12ax7 is by far the best known preamp tube among guitar players. Psvane 12au7t grade a vs nos telefunken 12au7 psvane. Some used 4knob tube drivers marked chandler are not the original design by bk. Davids 80s chandlerbutler and the current bk buter tube driver, and. I pulled the yugo 12ax7 and installed a 1962 blackburn mullard 12au7,now.
I would take an e88cc or 6sn7 way before any 12au7. Without a thorough knowledge of tube types and their substitution possibilities, you may be overpaying for your new or. Tube rolling 12au75814 family tubes talkin tubes the. Jun 22, 2006 originally posted by ferbose i have a cayin ha1a and which uses 12ax7, 12au7 and two el84. It comes stock with a 12ay7 for the preamp tube and 12au7 for the output driver tube.
This tube has a specially designed cathode which can withstand long periods of time in cutoff without hurting the tube. May 07, 2016 my cary cd player 303300 uses two 12au7 tubes. The a designation is more for application purposes, designed to be used in a series heater circuit of tvs, radios and other older electronics. Compared to the earlier mullard with the folded plate these consistently last longer, have. These tubes are dual triodes actually two tubes in one. My siding with the 6sn7 tube over the 12au7 is actually based on the air and ambiance, and complete lack of noise i have received from good octal tube preamps.
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