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City: Sandwick, BC, CA
Low B+ can be caused by bad paper capacitors as well as bad electrolytic capacitors. When a paper capacitor becomes leaky enough it behaves more like a resistor, and with the bypass ones, routed between a plate or screen grid and B- it can load it down quite a bit. If this set had a treble control capacitor across the primary of the output transformer I would also check and replace that capacitor. Philco typically connected those between one end of the output transformer primary and ground, with a resistor in series, even so it should still be replaced. Another fault that this set may have is that the big multi tapped resistor, in series with the B- side, may have a section that opened up, Philco liked using candohm style resistors that were riveted to the chassis, it's very common for those to become open.
Regards
Arran
(This post was last modified: 06-28-2014, 10:29 PM by Arran.)
Messages In This Thread
RE: 41-300x - by Arran - 06-28-2014, 10:23 PM
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