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1950s advertisment for the Oahu Tonemaster, like most of the Oahu amps it was also sold as Supro
and National.
1947 single ended lap steel amp.
1948 guitar amp, same circuit than the Tonemaster.
1952 Oahu Guitar amp...
6SN7 input, dual 6V6 output and 5Y3 rectifier
1954 with new logo.
Last year that they used octal pre-amp tubes, for a short while all Oahu amps came with miniature input
(either 12AY or AX7) and a 6SN7 phase splitter. Since 1956 they used miniature input tubes only.
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