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RE: schematic

``In a normal Class A PP amplifier the whole OPT primary is used by each tube , Only in Class B is the output primary use one half by one tube and other half by the other tube.``

- Nope , this is not true at all ! Regardless to class of operation with the single source PSU connected to CT of classic PP Amp OPT each tube always use only one half of the transformer primary coil !

About OPT again :
Each type of tube Audio OPT it is one big compromise in itself !, even Circlotron OPT it is .
Some Amps topology just allow less OPT performance compromises , some Amps topology require more OPT performance compromises .
So the best Amps OPT it is actually No OPT at all , but just OTL !
Best Regards

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