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Repairing the dead trem on a 2275-65 and was curious as to what's going on.
The oscillator is working, nice strong signal on the collector of the 2N3391 npn, but trem wasn't.
R42 has a 330K instead of a 220K on the schematic, and when I changed it to a 220K I was able to bias it and have a good strong tremolo.
What is actually happening with the 2N4091 Nch JFet/chopper?
Is the signal on the gate varying the low (23Ohm) resistance between the Drain and Source?
You can't see any change or signal on the drain with a meter or scope.
The oscillator is working, nice strong signal on the collector of the 2N3391 npn, but trem wasn't.
R42 has a 330K instead of a 220K on the schematic, and when I changed it to a 220K I was able to bias it and have a good strong tremolo.
What is actually happening with the 2N4091 Nch JFet/chopper?
Is the signal on the gate varying the low (23Ohm) resistance between the Drain and Source?
You can't see any change or signal on the drain with a meter or scope.
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