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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?

Supply voltage?

That fish is a whopper! How the drain voltages looking?

If you're going by the schematic above, use 18K for R8 and 24K for R9. That should give you about 5.3V on the drains with a 9V supply. Also, I used 2u2 for C3 ad C7 because I had those laying around. Those caps could probably drop to 100n without running into trouble.

Wow! I don't think I even have a shipping notice yet on mine. Ordered from Digikey. I'm also planning on trying a non-inverting servo bias on the JFET gates and possibly just a simple voltage divider on the gates. You can bias up a Black 65 with trimmers that way without changing the Drain or...

Overdrive. Sounds great at low and med-high gain. Highly recommend.

Agree with Chuck, but I have a bit of an out-of-the-box suggestion: Try 1N5817 you use for polarity protection. You probably have some around and they're hella leaky like a D9-Russian whatever.