PP Amp Input Stage
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| Posted on October 18, 2015 at 11:56:55 | |
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Posts: 50
Location: Illinois Joined: November 17, 2000 |
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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