Powersound Overdrive question

[Knobturner]

Hi all, just wondering if for this build is it possible to use a larger capacitor for the two 25uf caps?
I can't seem to find any 25uf, but I do have 33uf... Would this work?

 

[JamieJ]

A 22uf would most likely be a better option than the 33uf.

 

[Big Monk]

I think you could get away with either 22 uf or 33 uf. Since you already have 33 uf id say go with those.

I don’t have the Power Sound But do have a Vick Audio Overdriver. I don’t think 33 uf would be a bad sub.

You might want to consider a 1kC Gain pot though. I believe that’s a common mod for this circuit and my Overdriver has one.

 

[Chuck D. Bones]

Did you mean C10K?

22μF, 25μF and 33μF should sound pretty much the same.

 

[Big Monk]

Did you mean C10K?

22μF, 25μF and 33μF should sound pretty much the same.

Nope! 1kC. I had originally read about the mod and when I opened up my Vick Audio Overdriver to check, sure enough, it was 1kC.

Don’t quote me on this as my original source was definitely online chatter, but the 10kA pot bunches much of the gain up at the end of the dial and the smaller 1kC has a smoother transition.

 

[Chuck D. Bones]

I agree that A or B taper is wrong for the GAIN pot, but with 1K you can't turn the GAIN down as low. That's probably best for most users. I know some of the guys on these forums would just dime the GAIN control, in which case the taper & resistance don't matter.

 

[Big Monk]

I agree that A or B taper is wrong for the GAIN pot, but with 1K you can't turn the GAIN down as low. That's probably best for most users. I know some of the guys on these forums would just dime the GAIN control, in which case the taper & resistance don't matter.

I’ll open it up tomorrow and pull the circuit out just to double check. I can say that the Vick Audio Overdriver, which is a Power Boost when run at 18v essentially, works pretty much as a boost pedal with the gain rolled all the way down.

 

[yazooligan]

I tracked down 25uf caps for mine, but I wasn’t aware of the Gain knob mod. I got great results with the gain maxed and rolling back my guitar volume for what it’s worth.