Ac15 ef86 mod. I'm telling you it's a totally different amp.

Ac15 ef86 mod I did some mods to the scheme to eek out gain (have a build thread and pic of modified schematic) and a trem depth (which subsequently alters the ef86 bias). It is designed to give you the classic Vox sound by providing as close to the old Mullard tone as possible. I think it gives a richer and really brings out the percusiveness in the EF86. I use the same values as the original schematic, 1M screen R instead of 4M7 and instead of 250pf for "Brilliance" I use 3 way 500p/1000p/shunt. If the original tank was "way too much" the MOD tank was "a bit too little". The ever-evolving AC15 underwent three revisions in 1957, with the last being represented in our 60 th Anniversary AC15. g. Winfield gives you 1 channel, a preamp volume, treble-only eq, cut, and master volume. Depending on clean headroom wanted, I prefer Celestion vintage 30 or Eminence Gov'nor for moregreenback or Eminece Private Jack for less headroom. EL84 and 5Y3. The current version of the Vox handwired AC15 and AC30 has a normal channel and a top boost channel, which can be blended, and Celestion Blue speakers. Jun 24, 2020 · Vox AC15 circa 1960 Preamp tubes one EF86, three 12AX7s (one for PI), one 12AU7 Output tubes two EL84s in class A, cathode-bias. The only valve that truly supplies that original sound is a new old stock Mullard EF86. New posts Trending Search forums. TAD EF86 / 6267. " 1-Dave Hunter First Stage Pentode Preamp Mar 6, 2021 · A lot of the 65Amps amps used an EF86 preamp. Jun 4, 2012 · Is it possible to mod the normal channel to an EF86? If so, is it pretty intensive? Supporting Membership. Jun 3, 2014 · Unfortunately lost when MEF files disappeared. ) Vox AC15 Heritage Retro Mullard EF86 full upgrade kit covers the AC15 1TV and AC15 HTH Head. The tube socket screws were beefed up and little rubber washers/gaskets were added to dampen vibrations in between the screws and the chassis. Bruges bla i AC15 og en del Hi-Fi . Dec 31, 2009 · AC15 is a great amp, I once had the AC Ten Twin and I think it´s the same amp-circuit. Jan 11, 2013 · The EF86 needs it's own input and never sounds good mixed IMO. I actually found that changing to 68pf for the TB Channel has made mine too dark once the speakers were broken in. The amp sounds fantastic out of the box but with a couple of simple changes it can be amazing and sound closer to the old 1960's AC15. The buzzing EF86 will drive you nuts in a combo. The heart of the Heritage hand wired series and the soul of the Vox sound is the classic EF86 channel. Much of what players would What tone do you have in your head that you are trying to achieve? If you are going for "real vintage AC15 tone", check out the de-Lisle Eighty-Sixed EF86 preamp pedal, which is more along the lines of a vintage AC15 preamp circuit than what Vox is putting out today (not better, just different). Not much to do with the AC15. Being a tinkerer, I then put in some better tubes and a Celestion Blue speaker. Some say it gets really close to a vox sound, some say it's miles away, but in any case it seems to have a nice voxish vibe to it, at least it's as much vox for myear as iwould like to have (e. We also got tired of the expensive EF86. There are hundreds of pages of Tube amp information on my library page. 275,00 kr. A few tips: Use an isolation mount for the EF86 socket. Features: The features set is parred down from traditional AC15/30 units. JMI ac15 schematic except I modded the tone control with an unusual tone circuit Iv'e only seen on one other amp. Sep 14, 2022 · The AC15 and AC30 had made a name for themselves, and others were eager to grab some of the glory for themselves. For those of you considering a combo Vox Amp Schematics to assist you with your amplifier repairs and modifications. Apr 8, 2005 · The 220k load resistor on the AC15 circuit should result in a higher gain, and perhaps a glassiness that can give that Voxy top-boost sound that some folks like (the top-boost being Vox's replacement for EF86 in early AC30s). A tribute to the amp that started it all; the 1957 AC15/4. But I may have included my additions to the Paul Ruby mod. . Sounds great, except need to reduce the el84 cathode cap from 18watt value (500uf) to 250uf like in a ac15, and a couple small tweaks, but it sound great, maybe the fact that I used original Celestion Blue (Vox Silver Bulldogs) speakers for playing, in a 2x12 cab Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photo's, Sound clips. Have him build you one with an EF86 preamp tube in one channel, buy an empty cabinet & the speaker of your choice. Mar 24, 2021 · FYI The reverb tank I used was a MOD 8EB2C1B Medium decay. Schematic of the AC30/36 Normal amp, OS/065 (Jennings, 1960) Schematic of the AC30/36 Top Boost mod, OS/010 (Jennings, 1961) What is it? The Cyclone is a vintage-spec clone of an AC15 with an EF86 tube in its preamp. EF86 stabilizer mod. The cab is a 2x10" JBL E110 open back. What do I have to modify o transform the amp from PP to SE single tube? I attach the Sluckey's 1960 Vox AC-15 pdf. Rectifier EZ81 Controls Speed, Vib-Trem (switch), Ch I Volume, Ch II Volume, Brilliance, Top Cut Speakers one or two 15-watt Celestion G12 drivers with alnico magnets Output 18 watts RMS. Vox AC15. Forums. All three stock voicings sucked, as did the low cut mode. Jul 3, 2019 · Hello there!, I love the Sluckey's 1960 Vox AC-15. Don't like all the bells and whistles vox added, prefer the series cap(or two) w/ shunt switch for ultra fatness. It has mercury mag transformers the OT is the size of 4 quarters stacked together (not really, but close). The Vox AC15 is a highly revered amp, capable of delivering amazing sounds at a power level that won't crack wall plaster. The Trem effect does not work but both channels work- it is priced accordiingly. Like in the Voxer or 65 amps London, etc. Apr 7, 2014 · Here's a link (there are others if you search under "AC15 bright cap mod:" Vox AC15 Mod Guide | END OF THE GAME The two modifications above made the amp really nice. These are a good idea as a head and a PITA as a combo. Instead we use a cascoded E88CC that is in current production. Don't improvise, buy one. Also put a push-push pot in for the Top Boost channel volume pot. Basically The Paul Ruby mod clamps the negative PI swing to avoid driving the power tubes into grid conduction and therefor avoiding the bias shift that so commonly causes heavy crossover distortion in EL84 And then i read about the ef86 mod to the normal channel. So many other people made copies of these flawed amplifiers. What's new. Home. Didn´t modify it though as it had the creamiest distortion I´ve found. Nov 13, 2013 · Contact Mark from Frugal Amps dot com. All of these "boutique" manufacturers and hobbyists made exactly the same mistake: they used the exact same problematic circuit, and (no surprise) experienced exactly the Schematic of the AC15 amp, V-1-5 (Vox) Schematic of the AC15 1990s re-issue pre amp, AC15-60-02 Iss 1 (Vox, 1996) Schematic of the AC15 1990s re-issue power amp, AC15-62-02 Iss 1 (Vox, 1996) AC30. Please visit my Tube Amplifier Forum Here's the place you can go to ask tube amplifier questions. May 10, 2014 · Download my full size board layout, drill guide, jumper guide, ground scheme, schematic, and more in a single PDF. Come to think of it, my AC10 probably has the same AC15 circuit on the EF86, and it sounds very chimey at lower volumes. EF86. You will get a AC15 amp for less than a Vox! Mar 11, 2016 · Owner of 2 modded AC30ccs here. Fixed all that and increased the EF86 channel gain to JMI era levels. The 60 th Anniversary AC15 is a faithful recreation of a true landmark amplifier in VOX’s rich history, the EF86 equipped AC15 from 1957. High end components and JJ tubes. 12ax7. My interpretation of the Vox AC15. To me a distorted EF86 sounds nasty and I don't mean nasty in a good way. pr stk. He basically reinstalled/beefed up the tube sockets on the ef86 to prevent vibration in the tube. here is the EF86 channel with the AC30 "top boost" tone stack. The trouble is, the schematic in the catalog was designed to extract the maximum possible voltage gain from the EF86, for use in microphone preamps, tape recorder playback preamps, record player magnetic cartridge preamps, et cetera. It's made by Winfield Amplification in Arizona, USA and is packaged as a seperate head/cab. Changing to better quality signal capacitors. Dec 31, 2010 · The stock amp had a 3 way switch offering different voicings for the EF86 channel. I'm telling you it's a totally different amp. Seems to have a bad rap, and I have owned the newer AC30 Custom and found that to be inferior - even stock. May 22, 2018 · The input pentode circuitry for the VOX AC15 and other similar guitar amps was lifted straight from the back of a tube catalog. Cheers! Apr 24, 2006 · What you get is a really thick warm clean tone. "All told, a rare combination of qualities that together create an amp that is unparalleled in the studio and pure bliss to play cranked up in clubs and on small and medium stages. Is the EF86 integral to "classic" Vox sound? Jan 8, 2012 · I recently made a couple of simple mods to my AC15HW1 amp. There are four basic changes :-Reducing the DC filtering capacitor values and using better quality caps. I'd like to modify it to fit a single 6V6 power tube (I don't need 15W). pdf (914KB) These mods are a nice addition to the stock AC-15. 3. It was still a good upgrade, but if I had an AC15C1 again I would think about modding the reverb driver circuit to increase the gain for the MOD tank. Vox put an EF86 channel and a 12ax7 top-boost channel in some of their handwired AC15s and AC30s. Have been thinking of using a high Gm tube have not gotten that far. (Note: 11/5 - Added a pic of the simple mod to the ef86 tube socket. Jun 4, 2013 · Finished mine yesterday. The Because I just bought an oldie AC15, I dug a bit more into the amps and also got across a few 'clone builders': JMI makes a very faithfull rendition of the old single 12" AC15 with the EF86 channel and the vib/trem channel. It really is a great amp once it has been subjected to some of these mods. the Voxer). Down = Top Boost. zmppr kas goel bwnccd bqdkr oqqyp bfxf cooq srjhza xkahkjb