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What about ditching R14 and R13, using a 27K for R17 and a 5K trimmer for R18 with the wiper going to R15 for biasing?

Phase 90 to 91? Leaving us with a cliffhanger! Great article, Chuck!

It's just a personal project with a lot of SMD parts and pretty uncommon tubes - not at all suited for a DIY project.

Thanks, bud. I didn't realize the pics weren't clickable til you said something, so I got some bigger versions.

So I was fumbling around with using an opamp servo to bias JFETs and Chuck followed with a killer servo design for a Fuzz Face-style Germanium fuzz. In short, it's the absolute BALLS. Easily among the favorite fuzz boxes I've ever built - or played, for that matter. You can see the schematic and...

OMG, you're right. I forgot all about his flanger project.

Not yet. I've got 3 or 4 of them sitting my desk that I haven't gotten around to messing with.

Would a uC StompLFO work in there?

Suggestion: Take a pic of the guts, mirror it and use that for a decal on top. Damn that's pure hawtness.

The first thing to do is get a digital multimeter and measure the voltages on the pins of all the 8-legged chips and report them here.

I think I'm going to have to quit my job so I can keep up with building all the cool circuits you come up with, Chuck. Love everything about this one. That breadboard setup is super slick, too. Are the aluminum rails glued to the board? Don't see any screws.

$6 and Limit 3? Gotta up your game, Electric Goldmine. Imagine the sheer elegance of your Fuzz Face in one of these $1 salad bowls from the Dollar Store:

Say, Chuck, where would you buy components back in those days?

I probably watched that demo 20 times when you finished that thing. One of my all time favorite amp builds.

Dunno about yours, but what I've got on my board is eerily low noise.

Would it be worth it to add a small resistor in series from D1 to C9?

My best friend lives near Houston, but his kids wanted to go with their friends to a weeklong summer camp in Montana. Met my buddy in Missoula, and after we dropped off the boys, hit the road for a nearly 3,000 mile, 5-state ramble. These are my two favorite pics for contrast. The first one is...

Great stuff. I literally smacked my face reading that bit about flattening the Muff stack by making the values match. It's so obvious when you put it that way, but I never thought about it like that before.

Did my own project. I'm talking about the MacGUffin build. Tube preamp pedals are getting more popular and there are more options out there. Two notes even makes their own line and you can get them reasonably cheap second hand. There's also a DIY'er with a company called sushi box FX and at...

Mentioned this in another thread, but I love my Two Notes Cab M+. I use it with a tube preamp I built. The Cab M + and Iridium are both DSP. I chose the M+ because it costs less and lets you bypass the built in preamp so I can use my own. Headphone out is very good and has an aux in for playing...