10-07-2020, 11:15 AM
Hi.
Well we are now running with an 1N60P. Initially I wasn't impressed as the distortion was very bad but adding a 5.6 Meg between anode and the filament supply of just over a volt totally cures the distortion and the whole set is much more lively. I'll redraw the circuit with the mods. I am getting over 2 volts P-P audio across the headphone and 200mv P-P on Spirit Radio, which is still perfectly loud enough for normal listening.
Well we are now running with an 1N60P. Initially I wasn't impressed as the distortion was very bad but adding a 5.6 Meg between anode and the filament supply of just over a volt totally cures the distortion and the whole set is much more lively. I'll redraw the circuit with the mods. I am getting over 2 volts P-P audio across the headphone and 200mv P-P on Spirit Radio, which is still perfectly loud enough for normal listening.
