PP Amp Input Stage

K&K Audio / Lundahl Transformers

Welcome! Need support, you got it. Or share youe ideas and experiences.

Kevin, referring to your push-pull amp input stages, you said you "wanted something as simple as could be made that had phase-splitting capability and lacked the soul stealing plate resistors." I wonder what in your experience are the measurable and sonic differences between a CCS loaded and a resistor loaded differential pair (assuming it is cap-coupled with transformer phase splitting)? CCS plate loading should have lower distortion and provide good power supply hum and noise rejection. Resistor plate loading with a CCS at the common cathodes forces dynamic balance and feeding the stage with a shunt regulator should provide good power supply isolation.

BTW, I think resistor plate loading with a CCS in the tail as implemented in your ST70 kit sounds pretty good!

Thanks.

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McShane Design

Topic - PP Amp Input Stage - dhieber 11:56:55 10/18/15 (5)

RE: PP Amp Input Stage - KevinC 16:34:44 10/19/15 (4)

Question - dhieber 09:52:19 10/22/15 (1)

RE: Question - KevinC 09:03:49 10/26/15 (0)

Thanks - dhieber 15:15:02 10/20/15 (1)

RE: Thanks - KevinC 09:12:48 10/26/15 (0)

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