While I’m in the process of modding / rebuilding some Vox amps, I thought I might try the original Vox AC-4 from 1962, or at least a simplified version of it.
Here’s a link to the full vintage Vox AC-4 schematic and amp details.
Apart from the simplicity, I want to try something with an EF86 pentode valve as the preamp. These were in a lot of early Vox amps, but they were more difficult to manage than an ECC83 as they are a bit microphonic, and this became a problem as wattages increased. Less of a problem in a small amp like this – but still needs to be managed.
I have not detailed the wiring of valves, resistor wattages, cap voltages and transformers etc on my layout, as you can work this out from the schematic – and if you can’t work it out, you should not be playing inside amps.
VOX AC-4 SCHEMATIC – TREMOLO CIRCUIT REMOVED
ORIGINAL VINTAGE VOX AC-4 SCHEMATIC
MODDED AC-4 LAYOUT
