07-12-2013, 09:34 PM
I've started work on a cosmetically nice Philco 96 (one of Philco's last TRF sets, I believe). This set seems clean yet it has a lot of electronic problems with open power resistors, coils and an open input transformer.
The primary of the input transformer (no. 38 in schematic) from the plate of the 27 first audio tube to B+ is open. Secondary goes to push pull 45s and is OK. Question: I know it will be difficult to find another input transformer to drop in so can I use RC coupling as a work around for this set? I have done similar things with battery sets with open interstage audio transformers. I've used about 22K resistor across the open primary and a 0.05-0.1uF capacitor between the primary and secondary of the transformer. Do you think that would work here?
I've attached part of the schematic showing the input transformer.
Thanks,
Mark
The primary of the input transformer (no. 38 in schematic) from the plate of the 27 first audio tube to B+ is open. Secondary goes to push pull 45s and is OK. Question: I know it will be difficult to find another input transformer to drop in so can I use RC coupling as a work around for this set? I have done similar things with battery sets with open interstage audio transformers. I've used about 22K resistor across the open primary and a 0.05-0.1uF capacitor between the primary and secondary of the transformer. Do you think that would work here?
I've attached part of the schematic showing the input transformer.
Thanks,
Mark
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