Vox AC30

The Vox AC30 is a guitar amplifier manufactured by Vox. It was introduced in 1958 to meet the growing demand for louder amplifiers. Characterised by its "jangly" high-end sound it has become widely recognized by British musicians and others.

History

The Vox AC30 was originally introduced in 1959 at Hank Marvin's request as the "big brother" of the fifteen watt (15 W) AC15 model, Vox's original flagship amplifier, because the AC15 was not loud enough with the screaming fans at Cliff Richard concerts. The AC15 was powered by a pair of EL84 tubes, an EF86-driven "Normal" channel, an ECC83-driven "Vib-Trem" channel, and rectified by an EZ81. The original first generation AC30 used a GZ34 tube rectifier, three ECC83s (12AX7) for the Normal channel and the tremolo/vibrato oscillator/modulator circuits, one ECC81 (12AT7) phase inverter, and EL34 tubes in the power amplifier circuit.

This first generation of AC30s were housed in "TV-front" cabinets, much like the early to mid-50s tweed Fender amps, and had a single 12 inch Goodmans 60 watt speaker, as opposed to the later, conventional twin 12 inch speaker configuration. These early amps sported a thin white covering ("Rexine") with a small printed diamond pattern and larger diamond pattern grill cloth. However, the EL34-powered AC30 was short lived, and a new AC30 version appeared in late 1959. This second generation AC30/4 had two channels with two inputs, hence the "4" in the model name, and a single tone control, and was powered by a quartet of EL84 (6BQ5) power tubes, making it truly a doubling of the AC15 power amp circuit. The AC30/4 also carried over the AC15's preamplifier circuit, which included the EF86 pentode in its "Normal" channel. Vox initially offered a 1×12" version but subsequently introduced the 2×12" AC30 Twin, which solved the volume problem at larger venues. The first AC30 Twins used two Goodmans Audiom 60 15 Watt Speakers, followed by Celestion G12 alnico speakers.