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OTL, Output Transformerless Amplifier User Group.

RE: Harvard Electronics H-1 OTL Amp

Perhaps a coincidence: In 1979, he made me a pair of H3aa monoblocks. When I went to his "factory" (one or two rooms on 72nd St, west of Broadway by a few hundred feet) to pick up my amplifiers, he was building an OTL headphone amplifier for someone. He was rather excited about it and showed it off to me. I have to wonder whether that was your amp, Chuck.

He made his own transformers, and the place reeked of tarry odors, probably toxic.


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