diyAudio - why p-p amp RL for class B is 1/2 the class A load?

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walter33333

12th February 2008 04:47 PM

why p-p amp RL for class B is 1/2 the class A load?

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why p-p amp RL for class B is 1/2 the class A load?

thanks!!

ilimzn

12th February 2008 04:54 PM

Because in class A PP both tubes work at the same time into the same load sharing it, so for each tube it looks like a load of twice the impedance (two times 'lighter' load). In class B tubes work in alternate phases, one for each half-wave, so the load is not shared - each tube sees the full load for one half wave.

walter33333

12th February 2008 04:56 PM

thanks

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