08-02-2017, 12:19 PM
Yes! 
I have now removed all the superfluous old (modified) power unit components. This has left me plenty of space under and over the chassis to put in a new PSU with isolating transformer. I believe that the 8uF can capacitor, visible on top of the chassis in the original images had every right to be there, as the hole does not look like it was added as an afterthought. It was connected between the screen grid of V3 (HT+) and earth, leading me to think it is just part of the HT smoothing circuit. I can check it outside the receiver, and it will be easy enough to put it back if it is OK. Some wiring will need to be replaced. I will then power the heaters with a 6 Volt sealed lead acid, and apply HT, gently from my variable PSU that can supply from 0 Volts to 350 Volts DC via an isolating transformer and a variac - and see what happens. The tray contains the componets removed so far.
Bob
I have now removed all the superfluous old (modified) power unit components. This has left me plenty of space under and over the chassis to put in a new PSU with isolating transformer. I believe that the 8uF can capacitor, visible on top of the chassis in the original images had every right to be there, as the hole does not look like it was added as an afterthought. It was connected between the screen grid of V3 (HT+) and earth, leading me to think it is just part of the HT smoothing circuit. I can check it outside the receiver, and it will be easy enough to put it back if it is OK. Some wiring will need to be replaced. I will then power the heaters with a 6 Volt sealed lead acid, and apply HT, gently from my variable PSU that can supply from 0 Volts to 350 Volts DC via an isolating transformer and a variac - and see what happens. The tray contains the componets removed so far.
Bob
