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.
Interspersed throughout are charts, sidebars and illustrations, and a running item called “Setting the Record Straight,” in which Elyea clears up many popular myths with the information he dug up in his years of searching.
Laudably, he is never reticent about what he could not verify. Certain to become the definitive book on the subject, Vox Amplifiers also sets a new standard by which other books on the history of our most beloved gear might be judged.
The Dave Clark Five playing the Tottenham Royal in early February 1964.
The band had four early AC50s The AC50 was brought into being initially with one end in mind: supplying The Beatles with power enough to make themselves heard over legions of screaming fans.
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.
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The Vox AC30 is a guitar amplifier manufactured by Vox.
John and George were to have 50 watt amps (the AC50), and Paul an 80 watt bass unit - the AC80/100, later the Vox AC100.
The design process evidently began in the summer of 1963, and was well advanced, if not complete, by August 1963, as an advert published the issue of "Beat Monthly" attests. Note the mention in the advert of "separate amplifier cabinet provides a total output of 50 watts undistorted", indicating that the AC50 was ready or close to being ready.
Check out Vox AC30 Topboost - Reasons & Origins for some very interesting reading on the early AC30 circuits.