1947 Oahu Tonemaster
Backside view of the same 1952 Oahu amp. The tube complement is a 6SN7 input, dual 6V6 output and 5Y3 rectifier.
Backside view of the 1954 version. This was the last year that they used octal pre-amp tubes. For a short time period, all Oahu amps came with miniature input (either 12AY or AX7) and a 6SN7 phase splitter. Starting in 1956 and thereafter, they used miniature input tubes only.
Picture courtesy of Adam Brass of DSP Doctor!
Picture courtesy of Adam Brass of DSP Doctor!
Picture courtesy of Adam Brass of DSP Doctor! http://www.dspdoctor.com/