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In Reply to: RE: Phase Shift posted by Triode_Kingdom on August 02, 2017 at 11:26:17
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.
I totally agree with your premise and I've been thinking the same thing for a long time now, at least on the few occasions that I've contemplated building an amp with an LTP splitter - haven't built one yet. Here's the basic idea of the circuit taken from tubecad.com with the only difference being that in the case of the cathode coupled inverter, we would need a plate load at the first tube.
That's not a phase inverter, but could be turned into one with some parts added.
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