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Philco 90 Oscillator question
bdi1976
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Posts: 82
Threads: 14
Joined: Mar 2014
City: Philadelphia, PA
#22

03-12-2017, 05:11 PM
I'm getting closer. I rechecked all coils again- all ok. After some calibrating I had a stronger signal but still no volume control. The replaced trimmer didnt help. Then I realized by accident that the signal I am picking up is exactly the same with or without an antenna attached. The antenna circuit is not functioning. If I put my finger on the top of the 24 RF tube the volume control returns and the signal is very strong and the voltage on the plate of the 47 tube shoots up from 1 to 25 volts. Any ideas on what's dead ?
Also the #1 resistor was reading 10 ohms originally while attached to the antenna coil but riders says 10K ohms. I replaced it with a 10K at the same time as rewinding the oscillator but never rechecked the original one to verify what value it actually had. Is 10K Ohms correct per the schematic?
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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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