I'm back with more questions:
First, the project box with the voltage divider circuit is built! It has two taps on the resistance, one at 3megs and the other at 6.25megs. That takes care of the low & high power issues of the Johnson Desk.
Rain has started here in the Pacific Northwest and the electronics of the pedestal will be on the dolly real soon. So while the beast is all out in the open, the coupling cap for audio sampling/trapezoidal display will be installed.
Question: Seems like a good time to mount some of the HV transformers on insulators. HV Plate, Modulation, HV Choke, HV Filament are the candidates. Did I miss anything?
In other discussions, the mention of fusing the center tap/ secondary of the HV Plate transformer could have issues??? The desk uses a full wave rectifier circuit, not a bridge. I've had others on the west coast 3870 group that were against insulators and suggested fusing the center tap. I don't quite agree with their logic.
Since the entire electronics are within an enclosure where fingers can't touch the transformer frames, insulators at first glance seems good enough?
Tnx, & 73's
wd8kdg
Craig