Re: JHS Superbolt

Posted by induction on Apr 12, 2016; 4:47pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/JHS-Superbolt-tp8459p29704.html

motterpaul wrote

While I appreciate the help you guys put into your LSpice research, I think that what Giudis is saying, as I also found, is that there seems to be a problem with the circuit design in that the tone control doesn't do anything.

I believe I understood you both perfectly well. What you said previously is that, for one switch setting, it acts like a volume control (which is not quite the same thing as not doing anything), and is exactly what my sim showed that it does ("the filter seems to be tuned to cut everything above 200 Hz roughly equally"). The problem with the circuit design is exactly what I addressed, and the mods I suggested should turn it into a traditional treble-cut tone control, which is apparently what it was intended to be.

Not that I don't enjoy reading about Jfets & tone controls, however. I might just take my tone control off off - at least I know I can do that and not kill the signal flow. A lot of times all those pots seem to do is cut treble (and not as if the design has too much treble).

If treble-cut is not what you want, getting rid of the tone control is perfectly reasonable.