10-28-2015, 07:03 PM
(10-28-2015, 02:36 PM)OZ4 Wrote: What happens when you apply a something like a 100uf cap to the bias line B to ground. This should swamp any ac hum riding on this line. There should be -50vdc here.
I don't have anything that large. I tried a 10uf and that did nothing. The bias is correct or I would not have the -56V on the grids of the 71's, measured from one side of the filament. The grid of the 27 reads -7V measured from the cathode.
