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RE: "Until you compare them to equally good no feedback circuits I can imagine you don't hear the consequences.."

Lew

IMHO original older J.Futterman OTL designs which uses triodes but not pentodes in asymetrical SEPP(Single Ended Push Pull) OPS can probably have almost that SE amp sound signature , without of any of my doubt that Futterman amps are really PP amps and also regardless of use of significant amount of GNFB .
But must say that only some THD analyzer probe can reveal real output THD signature , so if THD spectrum consist from mainly second harmonic followed with much lower level of third harmonic and even almost non existand traces of higher order harmonics only than I can say that Futterman amps perfectly mimics SE amplifiers sound .

Best Regards !



Edits: 02/23/15

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