Hi, I'm looking for a tubeless MOSFET schematic of the Vibro Champ vibrato. I found a circuit with LND150s on the web, but I'm not quite sure whether it will work that way
Apparently there's a mistake in the LFO circuit using 100n caps instead of 10n but that might be a typo.
Any ideas and suggestions much appreciated
Last edited by uneumann; 02-13-2018 at 06:21 PM. Reason: clarity
Old Tele man: Equations provide theoretical values, SPICE provides approximate values; but, the ears provide exact values.
Hofstadter's Law: It always takes longer than you expect, even when you take into account Hofstadter's Law.
I'm not sure I've ever seen a Vibro-Champ with more than one 6V6 grid or more than one 220K resistor or even a bias supply.
The LND150 isn't a drop-in replacement for a 12AX7. As uneumann said, that circuit could work. But it would probably have the wrong frequency range and the wrong magnitude. That LND150 can practically swing the entire 340V, so the 68K would need to be increased in order to reduce the LF signal hitting V1B's cathode.
I have drawn up an idea for an SS vibrato replacement based on other ones I have used in other applications. I don't have a Vibro-Champ to try it on, but it looks good on paper (to me, anyways).
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