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City: Chicago, IL
I have two speakers. A single ended one for a Philco 90 with an open field coil and missing output transformer.
The one shown above is for a Philco 20 with push-pull 71A driving it. I disconnected the center tap and tied one end of the output transformer to one side of the field coil to make it compatible with my 90.
Messages In This Thread
RE: Philco 90 restoration - by Bob Andersen - 10-30-2021, 12:54 AM
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Recent Posts
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Part numbers to model cross
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Is there a reference somewhere where you can punch in Philco part numbers and see what models those parts were used in?Jim Dutridge — 10:17 AM |
Philco 42-345 Restoration/Repair
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Hi OSanders,
Look carefully at the band switch. Turn it slowly and "wiggle" it around the desired band. ...MrFixr55 — 12:33 AM |
5U4 vs 5Z4 tubes
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I think that RCA and GE introduced metal tubes in the USA in 1936. I don't know if they were being made by RCA, GE or b...MrFixr55 — 11:20 PM |
Philco 42-345 Restoration/Repair
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Vlad95,
Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM |
5U4 vs 5Z4 tubes
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A pre war Hallicrafters, and an early one too, very nice! 1936 is pretty early for metal tubes too, which would explain ...Arran — 05:58 PM |
Philco 42-345 Restoration/Repair
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Thanks Rod,
"When you hear the background hiss and no station it usually indicates that the oscillator quit" ...osanders0311 — 05:52 PM |
Philco 42-345 Restoration/Repair
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RodB
:beerchug:Vlad95 — 10:22 AM |
Philco 42-345 Restoration/Repair
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Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM |
5U4 vs 5Z4 tubes
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Well this is a Hallicrafters SX/9 circa 1936.
No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM |
5U4 vs 5Z4 tubes
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The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM |
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