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OTL, Output Transformerless Amplifier User Group.

Re: Yes, but I'm told O.T.Ls are Class A

Nope. OTLs can operate in Class A, AB, or B, just like any transformer-coupled tube amplifier. Some do operate in Class A up to a certain power output and then flop over into AB mode or some variant thereof. Futterman-type amplifiers (e.g., Transcendent, NYAL, etc) operate in AB or B mode mostly.


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