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RE: schematic

"- 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 ! "

That is only true in the DC.

Let's take a pair of 300b output tubes with a common cathode bias resistor.

The AC signal path will only include the power supply (CT of OPT) and the common cathode resistor for the imbalance.

If the tubes were perfectly linear and perfectly matched there would be no AC traveling out of the CT of the output transformer or across the common cathode resistor at all.

Take a look at the differential (forced balanced) and parallel feed differential examples in the link below.


I have ran my Class A1 PP 300b amp with and without a cathode cap and hear no difference at all. Not at the levels I play them.


Tre'


Have Fun and Enjoy the Music
"Still Working the Problem"


Edits: 08/20/11 08/20/11 08/21/11
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