Vintage Audio Technology for the Modern Studio
Historic Oahu pics

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1947 Tonemaster

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Backside view of the same 1952 Oahu amp.  The tube complement is a 6SN7 input, dual 6V6 output and 5Y3 rectifier.

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The 1954 version sporting the new and more familiar logo. 

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Backside view of the 1954 version.  This was the ast 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.

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1947 Oahu Tonemaster

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Picture courtesy of Adam Brass of DSP Doctor!

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Picture courtesy of Adam Brass of DSP Doctor!

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Picture courtesy of Adam Brass of DSP Doctor!

http://www.dspdoctor.com/