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RE: Here's a reworked schematic

I do NOT think Pat has a center tap ,on his power transformer's Ef voltage, so he showed us a pair of 50 Ohm Rs in series, the joined leads acting as a Center Tap, to feed each 2A3's 1K Rk to ground.

ONE BIG QUESTION 330 VDC versus 322 VDC ????

Is there any decoupling of the front end B+, from the Final's B+?? None shows in any of these schematics?? The Finals B+, connected directly to the Driver's B+, will goof-up the stability of the Input stage big-time

If there is NO decoupling, the circuit would need a higher overall B+, to allow an R/C for the front end's B+, hopefully down to one mVAC or so. Then, the Rk of the Finals will need to be increased in value to maintain the same goal of 43 mA and 265 VDC P-K. All doable. Is Pat listening now with no front end decoupling ??


Jeff Medwin


Edits: 02/23/17
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