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Philco 90 Oscillator question
bdi1976
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Posts: 82
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Joined: Mar 2014
City: Philadelphia, PA
#21

02-24-2017, 10:38 PM
I found a new resistor which somehow drifted 50% out of tolerance in only 1 year..the 10kOhm on the antenna..was only reading 5 disconnected from the coil. Put in a new one, cleaned all tube prongs with 200 grit sand paper, and got additional sound and clarity. Still a lot of background noise though unless I screw around with that IF secondary trimmer which clears it up. Is it possible it's just alignment since I rewound the oscillator coil? I tried adjusting by hand and don't know for sure if I'm at the right KC. I have a signal generator but not familiar enough To Try to align using it
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Messages In This Thread
Philco 90 Oscillator question - by bdi1976 - 03-07-2016, 10:00 PM
RE: Philco 90 Oscillator question - by TV MAN - 03-10-2016, 10:31 AM
RE: Philco 90 Oscillator question - by bdi1976 - 03-11-2016, 09:54 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-18-2017, 01:51 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-18-2017, 07:00 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-19-2017, 12:35 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-20-2017, 10:03 PM
RE: Philco 90 Oscillator question - by sam - 02-21-2017, 12:42 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-21-2017, 05:24 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-24-2017, 10:38 PM
RE: Philco 90 Oscillator question - by bdi1976 - 03-12-2017, 05:11 PM
RE: Philco 90 Oscillator question - by bdi1976 - 03-12-2017, 07:54 PM



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