Tools, Tones and Toys for Guitarists
Ignoring the gigantic and overly complicated trem section – this is one of my favourite sounding AC amps, which is most likely the inspiration for the Matchless DC30 pentode channel. VINTAGE VOX AC-15 SCHEMATIC Version: NO V-1-5 / OA/031 Apparently this schematic is a v3, redrawn by Thomas Organ, with some different component numbering. … Read more
The Vox AC6 is a departure from the Vox AC2 & AC4, in that it has a 12AX7 preamp, negative feedback, no trem, and for some reason, the tone control is before the first triode – it’s a bit of an odd-ball in the Vox lineup from the time. The 12AX7 preamp arrangement would give … Read more
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 … Read more
Despite the name – and even the familiar look – the original Vox AC4 has very little in common with the modern “AC4” amps wearing the same badge. The cabinet and the single EL84 output stage are about all they share. The AC4 started life as the AC2 in 1958. Fair to say that the … Read more
The original schematic for the 385 was killing me – just too many part numbers listed, so I cleaned it up a bit. I also removed the projector circuits. I think there are two versions of this amp – this is the 6V6 version, while the other uses EL84s (which is nearly impossible to find … Read more
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The little-known EL34 Vox amps from the late fifties, one of which is fixed bias. https://www.voxac30.org.uk/vox_ac2_30_1957.html. VOX AC2, 30 WATT AMPLIFIER. OS/003 (FIXED BIAS) VOX AC30, NO2. OS/007 1960 (CATHODE BIASED) EL34: individual 470 ohm cathode resistor and 50uf bypass caps. 5k output transformer
From what I can see, the only difference between the two schematics below is the 200ohm resistor after the rectifier (shown on the V-1-3 schem). There are some variations of cap values that can be ignored, such as 4n7 vs 5n etc. I think this may be similar to the AC15 schematics, where Thomas Orgain … Read more
