Another early Vox model is the AC2. It’s often described as being the same as an AC4, but there is one key difference — the tone control.
Instead of sitting in the preamp like the AC4, the AC2’s tone control is wired in the power stage, between the EL84 plate and the B+ supply (effectively across the output transformer primary).
It obviously works, but no one does this anymore - the tone control is sitting at just short of 300 volts DC, which isn’t ideal for a number of reasons. Curiously, they chose the opposite direction for the AC6, with the tone control before the first triode of the preamp.
Further AC2 reading: AC2 on VoxAC30.org.uk
VINTAGE VOX AC2, GUITAR AMPLIFIER SCHEMATIC
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