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Interestingly, I set my 70 (unmodified) next to the 570 and fed it the same signal. Aside from the typical 70 issues, it has a better high frequency response. So, now I'm going to do some audio testing on the 570 to see if the audio amp section is rolling off the highs. Or maybe my Celestion speaker cone is not so good! I may have to swap speakers to see what that does. Also, maybe I'll change that 220 pf cap to a 100 pf in the detector circuit. Lots of stuff to play with.... fun!
Messages In This Thread
RE: Philco 570 - by rfeenstra - 06-12-2019, 10:14 PM
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Philco 42-345 Restoration/Repair
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| So far still no broadcast, I am posting pictures of #14 Oscillator and also a resistor #27 which connects to an XXL tube...osanders0311 — 04:02 PM |
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Part numbers to model cross
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| I believe there is that document, and I think we might have it in the Library.morzh — 03:29 PM |
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Philco 42-345 Restoration/Repair
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| Ok MrFixr55,
I have tried the DeoxIT D5 on the band switch and even though it has relieved the tension I felt when turn...osanders0311 — 11:11 AM |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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Philco 42-345 Restoration/Repair
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| RodB
:beerchug:Vlad95 — 10:22 AM |
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