[MrFixr55]

Hi Lead Fingers,

In your set, how many tabs are on Resistor #46A? More than 3?

Does one end terminal go to chassis ground?
Does the other end terminal go to the cathode of the 2 '43 output tubes?
What is the resistance between the cathodes of the output tubes and chassis ground?

This is an interesting setup. Most sets from the early and mid 1930s have all the cathodes at chassis ground potential. A resistor, usually a multi-tapped resistor existed between B+ and the center tap of the transformer secondary that provides the B+. One of the taps of the resistor is made to chassis ground. Grid resistors or interstage transformer center taps go to various parts of this voltage divider between chassis ground (B-) and the center tap, which becomes C-. Sets made around and later than WWII usually had the center tap of the HV secondary at chassis ground and cathode resistors for all tubes requiring a negative grid bias, particularly the output tubes. Your set seems to be a hybrid of both styles.

The schematic shows a 3 terminal resistor with one end at chassis ground, the other end to the 42 cathodes and the center tap to the HV secondary center tap and the interstage transformer secondary center tap, providing some negative grid bias. the resistance between the center taps and cathodes of the 42s provide the rest of the bias.

If there is nothing attached to that terminal, I would not worry about it. Other trace any wires on the mystery terminal as to what tube it goes to, does it go to a cathode or is there a high value resistor between this terminal and either the grid of a tube or to the AVC circuit?

Hope this helps.

Unfortunately, you can't talk to the engineers unless you meet them in the afterlife, in which case, you wouldn't be communicating with us unless we were in the afterlife also.