These tubes should have a flat frequency response from any given circuit.
That switch might be a as simple as altering the clean headroom - a selection of clipping diodes perhaps.
These tubes should have a flat frequency response from any given circuit.
Yes and yescaspercody wrote: ↑16 Nov 2020, 21:19 Is C34 47nf?
Do the (4) diodes in the op amp U4 look to be 1N4148?