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Original Message
RE: Phase Shift
Posted by Caucasian Blackplate on August 2, 2017 at 11:33:26:
I've been bothered by that structure when I last saw it (in some Dynaco monoblock driver boards from somewhere) and I wondered why you'd bother with the direct coupling only to have a coupling cap stuck on the other grid.
In these fixed bias amps with negative rails, why in the world wouldn't they put a CCS between the negative rail and the LTP, then ground one grid and have a single coupling cap to the other? You'd get the added bonus of being able to drastically raise the impedance of the plate load resistors on the LTP which doesn't hurt anything either.