Admiral 17T1: Never Give Up, Never Surrender

[Notimetolooz]

Originally Posted by Winky Dink

Hence I wired the 17T1 to be in compliance with the Telaides schematic. Except for R41.

Winky

You shouldn't put a teaser out like that.
The obvious next question would be "So how is R41 wired?".
After searching the schematics that you posted, and ignoring the ones of questionable heritage, the connection of R41 are all the same except the SAMS 19A1. That SAMS shows it connected to B+, the same source as the horizontal size pot, this indeed seems to be how your R41 is done.
The set uses what is sometimes called a "split supply" like many. The audio output stage (V4) receives B+ for power, the audio output tube is one of the tubes in the set conducts a fairly constant high current. A voltage is developed from the cathode (pin 8) that is also fairly constant, this voltage is used by several other circuits for power. The Wallace Telaides schematic shows this voltage supplies R41 not B+. B+ is much higher than the voltage from the audio output cathode.
Just to eliminate them as a source of a problem why not replace C37 and C39 with micas. Micas are available.
https://www.digikey.com/en/products/...102JO3/1918615
Expensive but maybe worth saving the torment of solving the problem.