For anyone looking for the Vox UL730 (the amp it probably was, scrolling through the thread), Aclam has made a copy of the preamp it in pedal form. It was also used by The Beatles around Revolver and Sgt. Peppers:
Discover Aclam's Amp in a box pedal: Dr. Robert. The most accurate replica of the legendary Vox UL730 amp. Made with passion and precision in Barcelona.