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02-17-2025, 07:46 PM
Hi Guys
I just lost my entire post...
Physics added the sketch to post-1 after my comments were posted. The sketch shows rheostat-wired pots, contrary to his description in post-3, which describes a standard DC-coupled
post-PI-MV.
For the two standard DC-coupled post-PI-MVs, the version with the wiper as the signal input loads the splitter, where the version with the wiper output does not. Neither effect the bias voltage to the tube. Any splitter that DOES change grid-bias voltage should be avoided.
The AC-coupled post-PI-MV can be wired in the same two ways as above, but is ground-referenced instead of referenced to B-. The two forms behave the same as their DC counterparts.
The design in the sketch has pot-X tied to B- if CW is supposed to be the loudest setting. The 2M2s are redundant.
I just lost my entire post...
Physics added the sketch to post-1 after my comments were posted. The sketch shows rheostat-wired pots, contrary to his description in post-3, which describes a standard DC-coupled
post-PI-MV.
For the two standard DC-coupled post-PI-MVs, the version with the wiper as the signal input loads the splitter, where the version with the wiper output does not. Neither effect the bias voltage to the tube. Any splitter that DOES change grid-bias voltage should be avoided.
The AC-coupled post-PI-MV can be wired in the same two ways as above, but is ground-referenced instead of referenced to B-. The two forms behave the same as their DC counterparts.
The design in the sketch has pot-X tied to B- if CW is supposed to be the loudest setting. The 2M2s are redundant.
