OTL Asylum

OTL, Output Transformerless Amplifier User Group.

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RE: WANTED: Futterman H3 OTL project - Harvard Electronics or Tech Instruments

Posted by unlisted on June 25, 2022 at 08:59:54:

Yes, you're right. There's nothing wrong with the circuit boards per se. The concern is that these are very early OTL3 models and the schematics I have do not match this amp. I posted a picture years ago and "rhinohifi714" noted seeing several differences. The biggest concern is some of the transistors I see under the board have no markings and it is not possible to identify possible replacement(s).