03-24-2022, 01:05 AM
I don't know, 40 ma seems kind of low for a set with a #42 output tube, the #80 rectifier tube is rated for 125 ma I think. I would try measuring the actual wire used in the field coil. Of course I am assuming the the field coil in the model 84 is used as a filter choke in the positive side of the B+ circuit, and not in the negative side on the bias supply, which would require a lower current rating.
Regards
Arran
Regards
Arran