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Yass! I've been having an absolute blast with this one this afternoon. Chuck's cooked up an epic one, guys. Buckle up.

Haven't heard it, but there's a lot to like in that schematic. Sure does look like a great "Swiss Army knife" OD.

Any more opinions on the Comp control? I'm suspicious I'd be inclined to make it a set value.

Absolutely impressive in every way. Wow.

Very cool! Yeah, seems to me Silicon for Q1 and Ge for Q2 would make more sense. I like the concept and you'd think you'd see more stuff like this. So don't shoot me, but when I was look into all this nonsense recently, I did come across a 'servo fuzz' fuzz face schematic to potentially deal...

I usually buy the Russian 6P14P, which is closer to a 7189. They used to last about a year, but I've had some bad luck lately and they're getting a lot hard to find and a LOT more expensive. Man, I miss the 'good 'ol days' of 8 years ago. :rolleyes: The power section on my amp is AC15, but...

And I've been wanting to switch over to 6V6s because I'm sick of replacing EL84s .... sigh.

Gotta be careful around here when it comes to dirt builds...

Great build and congrats on the little one!

It's exactly what youre describing. It'd also be handy to know what guitar and amp you play, because ODs vary on EQ profiles, which make a huge difference. Prince/King of tone would be smoother and just as flexible. Mojito's breakup sounds a bit raunchier and more amp like. If you want a...

Mojito

Not really. I wouldn't want to use a charge pump in this case because it adds more circuitry and cost. Plus, it already has plenty of headroom at 9V.

So the order came in and I've done some more experimenting. 1. The TL052 doesn't work in the application at 9V. Damnit 2. You can't use half a dual opamp for a servo and the other for audio. Noise with my opamps on hand 3. J201s I got will not bias correctly with a 5K6 drain resistor. Had to go...

Sweet! That sure simplifies things. I've always been able to gate bias, so I guess I hadn't considered that problem.

So here's what I'm talking about for biasing at the JFET gates. Of course I just altered the drain resistors on my build and it sounds great. This is a solution for keeping the drain and source resistors stock.

The more I think about it, the more I think the whole idea is a little %$&^ed-up in the head. Feels like I'm on Mouser shopping for the right $200K supercar someone can leave parked in their garage just in case their 1987 Chevy Corsica needs a jump start. In practicality, I think it could be...

Also, looks like in the picture, if that's the pin 8/power side facing us, pin7 isn't connected to the JFET source - just the cap to pin 5.

Hmm. What's the voltage at pins 3 & 5 of opamp? Junction of R8/R9?