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I didn't even know you could use positive feedback for the forces of good like this. With this one reducing C7 has helped open it up but I have now also reduced R13, just a little, to 2K7. I liked this one from stock, and now I have got it just right for me. With a 330 it is gloriously gritty...

Actually my first guess was going to be the tube rectifier but I checked the schematic I could find online and it doesn't have a tube rectifier. But as @jimilee says definitely check your power tubes. Kind of a no-brainer really now that I brain it!

Lots of them! The Animal, Blue Note, Majestic, and Calibre 45 are all the same basic circuit but with varying levels of gain. In some they connect the second half of the opamp to something and in others it was too hard apparently.

You could do that easily. As an example, use a jumper across where D9 goes and a small cap instead of D11. Then that setting is your treble snub. You'll need to experiment on values - maybe start with a 470pF or 1nF? Or if you want to maintain the diodes you can solder a cap on the underside of...

Surely that was done by a previous owner?? If you bought the pedal new like that I would never buy from that builder again! And yes, that would be to reduce treble.

Sometimes FX loops rely on shorting jacks to pass signal when nothing is in the loop. A friend of mine had a similar problem with a (I think) Peavey 5150. It was just that some dirt or corrosion had stopped the shorting part of the jack making decent contact - maybe the springiness of the...

I did actually use 2N5172 transistors - I think they were from Mouser. Sorry - didn't measure the HFE. Thanks @MichaelW !! The clone I built sounds just like the original I have.

If you like that one you'll probably like the Major Overdrive too. There is a Skreddy version and one he designed for Animals Pedals too. They're very similar to the Diamond Peak, so I added the bass pot in a similar way called mine the Old Fashioned. I think I might like this one even more than...

You might find Peavey style knobs at Antique Electronics: tubesandmore.com You got me thinking with your "Sibir" logo. May you should work out how to spell KLON in Cyrillic and build a Kon because you already have the Siberia bit. Why he calls it Klon Siberia I don't know. Maybe Finegan is a...

I'll try that now! It's remarkable just how much difference changing C7 made. I guess the circuit was excellent to begin with, but that one little change made a big difference to me.

Wow - some great info here! I can attest to C7 causing oscillation if reduced in value. I wanted to make mine brighter so tried 2n2 there and got a lovely high pitched whine. 3n3 works fine and helps an otherwise stock circuit open up in a good way. I find in stock mode the pedal sounds great...

It will make your bass less bassy when set at the lowest bass setting of the pot. You might even want to try a 47nF cap there to make it sound a bit more midrangey. Differences will be fairly subtle though.

What kind of compact bass will you be playing?

Great work! I have always loathed that Peavey logo - apparently Hartley Peavy designed it when he was at high school, and it shows! So you were brave to work with it but I think you did well. I can't quite make out what it says on the Figment at the bottom, between the Figment and the switch...

I think I did.. I tried removing R16 and it has made very little difference!

R16 is between a pair of hard clipping LEDs and a couple of gain stages. I could try just removing it altogether for a start because there are already clipping diodes in the feedback loop of the IC... So removing R16 would remove the hard clipping diodes. I would imagine that making R16 bigger...

I made Chuck laugh when I mentioned I was playing the Jump Drive, AKA LPD 68, through my Plexi clone which is based on a '68 Marshall. It sounds great, so why wouldn't I?? As you say, whther I had the pedal on or not it sure sounded like a '68 Plexi.. :)

Well there are plenty of "Marshall" pedals which sound little like a Marshall! And of course that's to be expected. The designer doesn't know what amp it's to be played through. I play my Brownout OD through a plexi style amp and it doesn't really sound like I turned the amp up louder. Doesn't...

Oh the Brownout is a killer pedal! Not sure how Marshall it sounds but who cares? It sounds and plays so well.

Te friend who described it as a treble boost also uses it as a fuzz in his band which plays a lot of Beatles songs.