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OTL, Output Transformerless Amplifier User Group.

RE: Harvard Electronics H-1 OTL Amp

Trust me, i have no intentions of cleaning that bottom panel!Since you pointed it out,it just dawned on me that those are Futterman's initials!Since then,the output tubes have been changed,a few of them are still the originals,the rest are a mishmash of Raytheon's and newer logo RCA's and uses a 6AN8 driver/phase splitter tube.If i may ask,what was Futterman's association with Harvard? Did he work at/owned the company or did he just license the design to them.From what i read,Harvard went under in the early 60's.Can't find a thing on them on the net......

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