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Historic Oahu pics

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1950s advertisment for the Oahu Tonemaster, like most of the Oahu amps it was also sold as Supro and National.

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1947 single ended lap steel amp. 

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1948 guitar amp, same circuit than the Tonemaster.

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1952 Oahu Guitar amp...

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6SN7 input, dual 6V6 output and 5Y3 rectifier

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1954 with new logo. 

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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.
 

Oahu is a registered trademark with the USPTO, all pictures by Oliver Archut.
Copyright 1996-2007.

AMI / TAB-Funkenwerk * 506 2nd St * Gaylord, KS * 67638