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
