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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.

Compare it to the Colombo Plexi Breed and decide for yourself. I do not place too much trust YouTube demos. Too many unknowns. ROG made two other Marshall emulators: Thor & Thunderchief. Both are JFET based. Menatone made a fairly complicated JFET MIAB, the King of the Britains(sic). And...

TLC2272. We want a rail-to-rail opamp, preferably FET input. LT1490 should work, haven't tried it. TLV2372 is the most economical, at least here in the US.

I only hear the hiss on my original Thunderbird when GAIN & TONE are cranked. I expect the noise to be variable from unit-to-unit depending on wire routing and parts quality. To quote Runoff Groove: "Some fans of our past JFET circuits may be ready to dismiss this project, thinking we have...

This one is less noisy. By boosting the gain in the input stage, I was able to reduce the gain in the 2nd & 3rd stages. One of the ways to minimize noise is to apportion as much of the overall gain as possible to the 1st stage.

Schematic updated. I moved the MORE switch to a better place in the circuit. It's done. Finito. Fertig. Fini. Finalizado. 終了した.

those kilometer-long cables might invite crosstalk.

I think 50 to 70 is a good range. If you want to cut the treble content a bit, consider increasing C5.

OK, a little off-topic, but hey, glad you like the breadboard. The base is a stainless steel pan I bought at Daiso, you can also get them on Amazon. The pot bracket I machined from 2" aluminum box tubing. Picked it up at a local metal supply warehouse. I cut it in half length-wise to get two...

Wasn't Purple Cat some acid that was going around San Francisco in the '60s? 😵‍💫 Something to keep in mind when using LEDs for clipping: some of them have a parallel diode to protect against reverse voltage. Check them before installing them or you may not get the tone or volume you expect...

I built one of these a few years back and my only complaint is the hiss. I replaced the aluminum caps with tantalum and it helped, swapped out a couple of opamps, but none of it made much difference. With the GAIN & Tone turned up there was too much hiss. Other than that, it is a sweet...

As-drawn, that circuit won't work and in any case is off-topic. Let's try to keep the discussion to the Monarch. Thanks.

I would not try a Sag control on the Viceroy. But don't let it stop you.