[35Z5]

Check from wiper to ground side of control, if there is more than a couple hundred ohms the pot is issue. If there is resistance in ground circuit of control, volume cannot be extinguished.

I have a radio here that had intermittent issue with increasing volume at minimum. Problem was control(resistance 20K at minimum), lightly recrimping the control lugs fixed it. Been OK for over two years.


BTW  Here ya go, grid cap lead to tube inside shield uses spring, soldered to chassis.

BTW #2 The transformer's only duty is to power dial lamp in background, orig this was a battery/AC radio without dial lamps. Oversize speaker, matching output transformer(under chassis) and 50L6 courtesy of junk Zenith radio/phono.