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Nice build! Yeah, those crazy Ruskies, marking the wrong end of their diodes.

Maybe you could share a schematic? My mental telepathy skills are not what they used to be.

This is a Marshall emulator. In a real tube amp, distortion happens in more than one place. The preamp tubes make asymmetric distortion (clipping). The 2nd & 3rd stages approximate the preamp distortion. The Ge diodes approximate the phase splitter / output stage more-or-less symmetric...

OK, I think this is it. All of the knobs do what I want. I got rid of the Bass Boost at the end and put the BASS control between the 2nd & 3rd stages. It works independent of the DRIVE knob. The LEVEL control is back where it was in the original circuit. I increased the gain of the last...

I'd like to see a schematic of the WIIO reissue pedal.

The purpose of the zener between G & S on a MOSFET is to protect the gate against ESD. The only parts of the circuit that could be exposed to ESD once the box is closed are the IN, OUT and POWER pins. Q2 and Q3 are nowhere near any of those pins. Once Q2 & Q3 are installed on the board, they...

How about we stay on-topic?

Still making tweaks, so standby for the next mod.

Then you're really not gonna like this one... Q1 buffers the input and feeds the Mid Cut circuit (C2-C4, R6-R9 & the MID pot). The Mid Cut eats some bass, so in increased C5 to compensate. U1A now gets stable bias from Q1 instead of the bouncy Vref. The rest is pretty much unchanged except...

Very clean build!

Not really. There are AIAB pedals with multiple stages of asymmetric clipping. I've seen one or two pedal circuits that use a single MOSFET in the feedback loop for asymmetric clipping, The only time I've seen positive feedback around multiple stages in a pedal was to cause oscillation. This...

I'm still tweaking the EQ on the fist stage. Trying to get the mids where I want 'em. I might have to add a switch on C2. with the positive feedback, this circuit is very sensitive to C7. There's a peak in the freq response around 2KHz (see post #1). Making C7 smaller, even by a little bit...

I like the lower gain channel, especially with the BOOST mod. If you reduce C7 to 3.3nF, try 330pF for C5.

Check out the original post referenced above. Several forum members have made boards. Szukalski usually posts gerbers on a file sharing site.

A very clever circuit and makes great tones right out of the box. It's sold as the Jump Drive here. The 2nd & 3rd stage use MOSFETs as asymmetric clippers. That's clever part #1. Looking at the 2nd stage (IC1.1), when the output (pin 1) swings positive, Q1's body diode conducts and the...

Don't let the government catch you taking pictures!

Hmmmm. We don't have to pick one over the other. Different pedals for different tones. I'm not sure that the Thunderbird is my fav MIAB. The Plexi Breed is a pretty sweet pedal. My top 5 in no particular order... OD-3 Mojito Viceroy Emerald Green Distortion Machine Diamond Peak (cb mod)...

Try reducing the 2.2uF cap at the input and/or put a 10K trimpot in series with that cap. Which guitar / pickups are you using? These vintage-style FFs are very sensitive to what's driving them. Both a blessing and a curse.

The order of EQ & distortion stages is different with different brands. Fender puts the tone stack before any stages that produce distortion (unless you overdrive it with a booster).

That's up to the guy who runs this website. You can put it on the Wishlist.