EVH-95 Sweep Cap, guts?

[Dingus]

Hi all,

        Just wondering if anyone has drawn up an EVH-95 wah yet?  I'm mostly just curious about the Sweep Cap, and if they did anything to the pot to make it seem "worn".



Thanks!

[Dingus]

Bump   

Nobody?   The website leads you to believe they only did something to the potentiometer to make it seem worn-in, and that they "hand selected" an inductor (which makes me think they would just pick one that's super in-spec, which I would hope is always happening...

What about the Buddy Guy wah anyone know what that switch is switching between on it?

[Paul Marossy]

Nobody?   The website leads you to believe they only did something to the potentiometer to make it seem worn-in, and that they "hand selected" an inductor (which makes me think they would just pick one that's super in-spec, which I would hope is always happening...

What about the Buddy Guy wah anyone know what that switch is switching between on it?

I haven't seen either of those wahs in real life, don't know if anyone else here has either.

On the EVH wah, I doubt that it's something as simple as just doing something to the pot. There's probably some kind of circuitry going on to try and emulate a very worn pot (everything but the scratchy sounds). I wouldn't be surprised if this is one of their SMD PCB designs with all kinds of little chips and stuff on it. The inductors are probably just checked by hand and they keep the ones that fall in a certain range to use in this pedal. I guarantee that they don't do this with their typical GCB-95 type wah pedals. It would cost them too much money, and therefore it's not even considered.

[Dingus]

Thanks Paul!  I might just have to pick one up if I can find it for a good price to see what they've done.

[Paul Marossy]

Thanks Paul!  I might just have to pick one up if I can find it for a good price to see what they've done.

I would be curious to see what they did on it...

EDIT: According to what I've read HERE, sounds like it could also be a custom pot with a special taper. It's either that or they are using a standard Hot Potz II and are doing something with the circuitry to approximate the one in EVH's "own wah pedal" (like tapering resistors or something). Wouldn't be able to tell for sure without seeing the circuitboard.

EDIT #2: Found some other info from a different forum - "GCB-95, Cantrell, Wylde, JH-1 all share the exact same circuit board with slight component changes to them. The EVH and Bonamassa are quite similar yet use different circuit boards and some very different parts making them whole different animals. The current JH-1 and Wylde are the same aside from the housing they're in. They're GCB-95s with red fasesl and .022uf sweep caps making them darker (boomy on the bottom with some amps and guitars). The Cantrell is the same as a GCB-95 but with an added knob that lets you roll off high end i the toe down position and the sweep cap (which controls how dark or bright a wah is) is a .012uf making it just a hair darker than a GCB-95 but no where near as dark as the sometimes too dark Wylde and JH-1. The EVH wah also shares the same .012uf sweep cap as the Cantrell yet it uses a different inductor and pot which makes the sweep much different (more mid focused) and much smoother (low friction pot). It also activates real easily thanks to shorter rubber stoppers on the rocker allowing it to contact the switch with next to no effort making turning it on and off nearly as quick as a switchless wah (95Q). It's circuit board is also different from a GCB-95 yet quite similar."

[joegagan]

looks like the same brand and series pot as the bonamassa signature wah i had here a few months back.

they had it factory adjusted to run between 41k and 97k on the footsweep. very unusual. and it still had tons of low end. the pot was a 100k overall, some sort of log taper. not sure what they tweaked to get it to do that, but after a lot of spice modeling wahs ( thank you gus) followed by real builds, i am convinced that many things are possible with tuning the circuit.

if dunlop ( tripps/ s.mcrae in the case of the bonamassa ) can tweak the circ to the pot like this, i would also assume they could electronically simulate a worn pot. have seen some cases where very worn 70s crybaby pot can go high R in a specific spot and get an interesting reaction. i wonder if that is what eddie was asking them to replicate.

[joegagan]

ps, it is no longer the hotpotz2 in these wahs. i now am wondering if all the sig wahs have these TT pots. there was an internet rumor around 6 years ago that the hotpotz2 was going to be discontinued, which caused the price to shoot up, but they are still being installed in the latest garden variety dunlops.

[Paul Marossy]

i would also assume they could electronically simulate a worn pot. have seen some cases where very worn 70s crybaby pot can go high R in a specific spot and get an interesting reaction. i wonder if that is what eddie was asking them to replicate.

From this page HERE:

" Dunlop found that over the years Eddie's unique wah style, which uses mostly the middle range of the effect pedal's action, had carved his own curve into the pot's resistive element, making the middle range even more defined and increased the low end sweep."

The question is just how did they choose to replicate it? Could be either scenario...

ps, it is no longer the hotpotz2 in these wahs. i now am wondering if all the sig wahs have these TT pots. there was an internet rumor around 6 years ago that the hotpotz2 was going to be discontinued, which caused the price to shoot up, but they are still being installed in the latest garden variety dunlops.

Interesting info...

[joegagan]

i think i am deciphering from the two different blurb sections that they electronically replicated it via inductor choice and other components. it is damn hard to to replicate what they are talking about in the pot itself.

[Paul Marossy]

i think i am deciphering from the two different blurb sections that they electronically replicated it via inductor choice and other components. it is damn hard to to replicate what they are talking about in the pot itself.

That's kind of what I'm thinking...

[Dingus]

Just to add, I found this video (https://www.youtube.com/watch?v=S46UqM4bumA) where they talk about making this wah. It looks like it's a custom made (150k) pot with a different (closer to linear?) taper (judging by a pic they briefly show in the video).  And a "special" inductor, would love to measure one.

[Dingus]

Just to update, I found the Dunlop part for the EVH wah inductor, and they title it as "562mH Inductor". I'm guessing that must be what his measured and they pick inductors close to it from their huge batch of current black inductors for this wah.

I'm still thinking that pot is a 150k, from the info in that video I linked, particularly around 1:40 and after (https://www.youtube.com/watch?v=S46UqM4bumA). Not sure what the taper might be called though.



Maybe if someone has this wah they could take the pot out and measure it as well as read any markings off of it?

[Paul Marossy]

Just to update, I found the Dunlop part for the EVH wah inductor, and they title it as "562mH Inductor". I'm guessing that must be what his measured and they pick inductors close to it from their huge batch of current black inductors for this wah.

Doesn't sound like anything special. From what I understand, the current stock Dunlop inductors measure around 580-600mH.

[OnFire5210]

Bump!

Anybody ever get any additional info on the EVH wah? In particular i'm interested in the custom pot, Q resistor value and mid resistor value.

Thanks!