Vox tone stack mods. Here's an in-depth analysis of it.
Vox tone stack mods To get into the amp, unscrew all these: Inside: Mod 1 - Bright cap mod: Jun 6, 2018 · Well, controlling the midrange is a big part of getting a good guitar sounds and the Fender/Marshall/Vox tone stack only goes so far in doing that. They are handy to toggle so you can still maintain the original AC tone, while adding flexibility to better accommodate your own setup. Feb 20, 2019 · First, the treble pot now only sees the 10k resistor to ground which makes the tone stack more lossy for high frequencies, and two it allows Bass/mid frequency to flow straight to the treble pot unimpeded giving a gentle bass boost. ) added a brite cap around the volume control (so he IS playing a Les Paul through this! b. " Jul 31, 2015 · I suggest you do and check the VOX tone stack there compared to the one above you will be surprised The only difference between the one I posted above and the TSC one is that TSC includes the . I prefer it off on the top boost channel but i also use the ac30esk tone stack mod( which makes the eq settings a little more radical in difference as you dial them in) my recommendation would be to do both mods and get a switch for both. Disconnecting the Mid resistor will completely remove the tone stack from the amp circuit. Jul 23, 2010 · Mod 2 - AC30 tonestack mod: (Original vintage tonestack setup for AC15/30) This one is a little tricky, since there are no spaces on the board to solder a jumper wire off the bass tone pot. Unlike the Fender tone stack you can achieve a mid hump by setting the treble and bass controls low. 8k Middle tone resistor's) ground. View attachment 1059759 Apr 3, 2012 · 2. Ime, one should have a clue before installing a one size fits all circuit change. . He's looking to replace the voltage selector knob with a bass roll off. Mar 25, 2012 · Here is a mod for improving the tone stack - but not mitigating the quirks. May 11, 2014 · The intention of the caps were to probably do a little smoothening of the tone. Tone Stack Mods Why have two identical tone stacks? Mod one of them. 8k Mid resistor is at the bottom of the schematic. Adding Mid resistance adds mid frequencies and reduces the tone stack load which adds gain. 14 314 Z2 Lumos Fuzzy Logic fuzzylogic jmi vox ac30 ac30cc mod amp amplifier modification modifications mods mixers mixer electric guitar pedals pedal stomp box stompbox stompboxes effects effect distortion Apr 28, 2021 · I have added an unbuffered FX loop on the little thing, and modified the tone stack to better follow the curve of classic VOX. Insertion loss is lower than the standard Fender tone stack, but obviously higher than 1 knob controls. Mar 11, 2016 · Tone stack tweak C16 = C23 (stock 56pf) -> 47pf Removal of Top Boost Cathode Bypass cap This is the U2 mod - the Edge's amp doesn't have this cap and it makes for tighter bass, more headroom/lower gain on the TB channel. Snipping out the attenuator network seems straightforward and repurposing the chassis hole seems easy enough. 5F6A tone stack and Raw Control location. Just add an SPST ON/OFF mini-switch to the Mid pot's (or 6. Tone stack types vary from amp to amp. I did, however, record myself directly before and after I replaced the stock Apr 7, 2014 · There's still plenty of adjustment in the tone controls. The 6. While this amp has a great tone stoc Sep 2, 2011 · UPDATE: 10/04/2012 – Someone in the comments section asked me if I had any recordings of the amp pre-mod and post-mod to compare, but considering the modding process happened gradually over time I don’t have any accurate recordings of the amp pre and post mod. Here's an in-depth analysis of it. Be sure and take a close look at the presence pot ground wire. OMMV. Some remove over 90% of the signal. Because this type of tone stack really loads down the guitar signal being able to eliminate the tone stack is a valuable option. Dec 18, 2017 · Hey all, so I decided to do the bright cap mod and tonestack mod on my AC15 whilst putting in a new alnico blue speaker and mod reverb tank. tone stack mods - looks like he; a. If it is connected to the mid pot you will need to give the presence pot its own connection to ground. Changing this to the “vintage” 47pf value very slightly reduces the treble. ) significantly shifted the tone circuit center frequencies, especially on the "lows" side of the tone knobwasting a lot of gain there, methinks c. Jan 29, 2021 · I'm relatively new to modding amps but comfortable around higher voltages. Change the tone stack values to those used in the JMI version. 4 - they have made the Normal channel fairly useless in tone (way too dark or way too bright) and limited its max gain. One of the *Hasse* or *Hasserl* Richard Hassebrock mods for Carvin amps is what is know as *Raw Control* It is a pot that is used to bypass the tone stack. imgur. If you find both sounds useful. The single This tone stack is featured in Duncan Amp’s Tone Stack Calculator in slightly modified form under the name “James”. This kit addresses a number of issues with this amp by improving the reverb, reducing noise and hum and revoicing the tone stack. 4 – they have made the Normal channel fairly useless in tone (way too dark or way too bright) and limited its max gain. Being a tinkerer, I then put in some better tubes and a Celestion Blue speaker. 3. remove bright caps on both channels (they are used to bring in more high end at low volume to give the cranked AC tone at low volumesbut they mess with input from gain pedals making them sound very grainy. 65 Deluxe Reverb Reissue & 68 Custom Deluxe Reverb Tone Stack Part Numbers: Normal or Custom Channel Tone Stack Nov 7, 2017 · After the initial work in 2014, I began to want a better tone than what I was getting; there was a pronounced peak in the response in the 2-4KHz range, right where the "VOX Chime" is probably located, but with my new cabinet and speaker, the chime was now way too pronounced. My friend asked me to help him with his AC4TV (schem attached). Raw Switch Mod Eliminate the tone stack and boost gain for a very tweedy tone. Mixing Resistor Bright Cap Mod Moar bright! Increase Preamp & Phase Inverter Voltage An excellent mod for amps upgraded from 6V6 to 6L6 power tubes. Nov 5, 2010 · I'd like to try replacing the bridged t tone stack with the tone switch that is used on the second channel of a Matchless DC30. 14, and other high quality audio effects and custom audio solutions. Remove the tone stack's ground and you completely bypass the tone stack. C9 = C18 (kinda nice to put on a switch) Coupling caps - change them out to Mallorys/Sozos for corksniffery good times Chart is from the Duncan Tone Stack Calculator. 3 - Vox went with a 56pf treble cap in the tone stack (C16). Lyle Caldwell psionicaudio pisonic psyonic syonic sonic Triad 3. My plan is to remove the tone stack starting at C3 and to reattached it at pin 7 of V1B. I do not know much about filters and plotting curves, so I would appreciate any feedback Mar 1, 2022 · And finally the cheap 470 and 56pf ceramics in the top boost coupling cap and treble EQ knob positions were replaced with 470pf but higher voltage rating, and 47pf for slightly, slightly less treble/ upper mids in the tone stack. Jul 23, 2010 · The preamps are already very similar, but these mods will implement the extras available on the current/previous AC30 lines. Aug 29, 2012 · The stock power transformer may develop issues, if it does, bite the bullet and get a Mercury, which will work well and last forever. " Celestion Blues are a must if you're trying to get "closer to vintage/classic Vox tone. I have build a 5F4 super and didnt like the scooped mid in the design, which sounds more like blackface than (Champ or Deluxe) tweed Jun 8, 2023 · Here's a discussion about this amp including some mods: Remove the 330K in front of the volume pot in the Normal channel. https://m. If you do install the Tone Stack Calculator be sure and see how a 25KL and 100KL Mid pot can act as a "Raw" control and boost the signal compared to a 6. I'm telling you it's a totally different amp. Jul 3, 2021 · It is a thing. He does one more that adds a "mid shift" switch but not sure how that's done: May 30, 2022 · I used the Tone Stack Calculator application to plot the frequency response of the tone stack, and compare it to those of Pathfinder 15r and an old school VOX stack. And then try to find values that could work and give a similar curve. It serves as the entire tone stack's ground connection. Tone Stack Bypass or "Raw Switch" This is a great mod for pretty much any amp with a TMB (treble mid bass) tone stack. Typical Fender/Marshall/Vox Tone Stack. The stock output transformer works ok, though a Mercury will sound better if your reference is "closer to vintage Vox tone. 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. Oct 6, 2013 · The list of mods: 1. 8k resistor or 10KA pot. The Baxandall does not generate the TMB "Fender Shimmer" effect. 022uF coupling cap inside the Tone Stack and the one I copypasted has it outside the picture, coming from the earlier stage. Presented below are the schematic and 2 layout diagrams. Unleash the tone of your Vox AC15C1 with the complete mod kit from Fromel Electronics. ) added a blocking cap to allow for the a/b switching in "a" mode. And back together it went. This kit is NOT for the AC15CC1. 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). Psionic Audio - offering the Triad, the new Telos, the 3. The pots do not track exactly like the VOX ones, but it's close enough so that we don't touch the surrounding stages. More info on the Baxandall circuit here. It's an old idea but pretty useable. Sep 21, 2019 · 3 – Vox went with a 56pf treble cap in the tone stack (C16). com/a/An789 ^ some pics of the The James (or passive Baxandall) Treble/Bass tone stack allows more control with less quirks than the Fender/Marshall/Vox TMB tone stack. I improvised something that works well. Change the tone stack caps and resistors to suit your taste. A couple of ideas for more midrange options - 1) adding a cap in parallel to the treble cap (usually 250pf in a Fender). The treble knob would be replaced by a the cut circuit found in Vox amps (as well as the Matchless). Changing this to the "vintage" 47pf value very slightly reduces the treble. epvayk uyyx eoc owynevow httwa hso gcqss fxahg yxuax skrpni