EHX Big Muff Mod

[kurtlives]

Hi guys first post here. I am a big pedal builder/modder guy and this seems like a great forum.

Anyways...... I have a EHX American Big Muff (it's a recent one) and I have been trying some mods on it.

http://web.archive.org/web/20070225090348/http://www.student.ru.nl/r.kerkhof/Taas/Mods/Big+Muff.htm<link to BM mod site.

So I am trying to do the Noise gate mod. I have added the trimpot/switch to the 100K resistor going to the base of transistor Q3. This did not do anything. Next I tried doing the same thing to the 100K resistor going to the base of Q2. Again didn't do anything.

Both times my signal dropped substantially or there was no signal when the mod was engaged.

What should I do, try doing the mod to all the transistors base limiting resistors? Is the trimpot supposed to be limiting the current going to the base or the emitter?

Thanks

[ambulancevoice]

did you do the mod parrallel to the Q3 emitter resistor???

[kurtlives]

Ya, I did the mod to the 100K resistor.

[ambulancevoice]

how exactly did thou wire it?
like this???

[kurtlives]

Ya but I used a trim pot.

[ambulancevoice]

hmmm strange
are sure its the 100k resistor to ground from q3 that you did it to?
also, is the trim pot new?

[StephenGiles]

Sorry, no mods to a Big Muff if there's an R in the month

[kurtlives]

Ya the trim pots new.

I have doubts about that site though. Like it says to add a mid control replace C1 with a 0.022uF cap and do some stuff with a pot. C1 is a electro cap...weird.

Also when he refers to a resistor he is sometimes wrong om the PCB # (ex R13).