Recent content by gtt

I'm curious as to the overdrive character of these? Would the overdrive character be different than a mosfet?

Whoops thought I had added it. Here you go.

Yeah I thought it was interesting. There's a dude at diyAudio doing hi-fi things with them.

I was reading about these crazy high voltage and current SiC JFETs (onsemi UJ3N065080K3S) and wondered if they could be used like a power tube in push-pull with a phase inverter and a transformer. The dream of course is an all-JFET Viceroy as an amplifier not just a pedal. ;) Chuck did you...

I built the Chop Shop and like it a lot. How would you compare/contrast the sound of this one with that one? The Chop Shop uses J201 and wants two with somewhat different Idss. This one is the 2SK208 JFET. Does that make a huge difference? How about the tone circuit, which is a lot...

I had to look up what a linearizing diode is, and I'm still not sure I fully understand it though I really appreciate the explanation -- IIUC these diodes are matched with the input transistors of the OTA to cancel out these transistors' non-linearity at low input signal levels? When I looked...

What's the input to the one OTA at R14 doing? Why doesn't that go to the other one?

That's really cool. Thanks for once again answering my n00b questions! I kinda always wondered how a compressor worked.

Ah ok, now I understand better when I was reading about the operational transconductance amplifier, and when it talks about Iabc. The peak detector is presenting Iabc to the OTA, which controls its resistance. Thanks for explaining! Let me ask another question then about this circuit. The peak...

I was curious so I read up on this a bit -- do I understand correctly that at a high level the CA3080/LM13700 are acting as a voltage-controlled resistor to vary the gain of the op-amp, and the control voltage for this is from the peak-detector circuit implemented by the four transistors?

Does the TL072 noticeably improve the noise floor? Is there any operational difference between the vintage CA3080 and the LM13700?

Did you design these from scratch or did you mod an existing kit?

Well, I have a cheap amp whose sound especially when turned up I'm not really liking, so I was thinking about getting something better. I respect very much Chuck (and all you other geniuses) so I figured I'd see. It's been very educational!

When you’re playing the pedal, you have a clean tone on that amplifier you mentioned?

Makes sense. When you're listening in headphones, are you doing some sort of cab sim? Personally I have a Blackstar HT-5R with a Celestion in it, set to clean, and also headphones via the XLR out and built in cab simulator, which I don't think is very good. Part of the reason for this thread...