Posts: 10
Threads: 1
Joined: Aug 2013
City: Dowagiac, Mi.
I just measured my original Philco 4990 mica caps, they are both marked with yel.-gn. dots and they are approx. 35pf in value. Also part #17 does not connect directly to gd. but to pin #4 of the #24 tube exactly where part #22, the other 35pf cap connects. If you look on the Philco mica caps parts list, #4990 is listed as a 35pf cap. with yellow and green dots. I really can't tell if the small choke was factory or not.
Good luck with your project- I can confirm that both sch. available are filled with errors and I really had my doubts when I fired mine up- but it works good.
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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 |
Philco 42-345 Restoration/Repair
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By the way.
osanders0311
Take a look here: Dial cord stringing Guides
May be here you can fount correct string settin...Vlad95 — 11:15 PM |
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