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Philco 20 - next project
#32

It plays again.  The resistors ore the originals with a parallel resistor hidden underneath to bring each resistor back to specs (I took the picture at an angle that hides all of them!).   The chassis is the original plating cleaned up with a very thin clear coating to protect it. Arran, I didn't realize that some rust removers may leave a protective conversion coating.  I may just rely on that in the future!  The tin plated tuning cap certainly looks different than the chassis but I really don't mind.  Kind of matches the capacitor can.  Next, I need to work on the speaker a bit to clean it up.

Question:  Most voltages are reasonable given the higher line voltage (thinking of adding a bucking transformer) except on the 2nd detector.  The chart says that the plate voltage should be 35 volts.  I get closer to 110 volts.  The grid is only about 2 volts negative compared to the cathode so the tube should not be close to cut off causing a high plate voltage.  Screen is at about 10 volts rather than the 2 volts listed.  This voltage comes directly from the voltage divider through a 250K resistor.  Result is the same with different tubes.  Any ideas?

               



The radio is tuned to 740, Zoomer Radio, Toronto in these photos.  Sounds okay except for the fading in and out. Love AVC (which this doesn't have)!  Not a problem if I tune to my local transmitter, though.  So far, I don't hear the distortion from the detector like I hear in the 70.


Messages In This Thread
Philco 20 - next project - by rfeenstra - 12-14-2020, 10:43 PM
RE: Philco 20 - next project - by morzh - 12-14-2020, 10:59 PM
RE: Philco 20 - next project - by rfeenstra - 12-14-2020, 11:06 PM
RE: Philco 20 - next project - by rfeenstra - 12-15-2020, 12:24 AM
RE: Philco 20 - next project - by Arran - 12-15-2020, 03:03 AM
RE: Philco 20 - next project - by morzh - 12-15-2020, 11:12 AM
RE: Philco 20 - next project - by GarySP - 12-15-2020, 06:33 PM
RE: Philco 20 - next project - by rfeenstra - 12-15-2020, 08:02 PM
RE: Philco 20 - next project - by rfeenstra - 12-16-2020, 07:42 PM
RE: Philco 20 - next project - by Phlogiston - 12-16-2020, 08:11 PM
RE: Philco 20 - next project - by rfeenstra - 12-16-2020, 08:32 PM
RE: Philco 20 - next project - by morzh - 12-16-2020, 08:50 PM
RE: Philco 20 - next project - by Phlogiston - 12-16-2020, 09:02 PM
RE: Philco 20 - next project - by rfeenstra - 12-16-2020, 10:49 PM
RE: Philco 20 - next project - by rfeenstra - 12-16-2020, 11:17 PM
RE: Philco 20 - next project - by fenbach - 12-17-2020, 12:05 AM
RE: Philco 20 - next project - by rfeenstra - 12-17-2020, 02:35 AM
RE: Philco 20 - next project - by Arran - 12-17-2020, 03:31 AM
RE: Philco 20 - next project - by Phlogiston - 12-17-2020, 11:17 AM
RE: Philco 20 - next project - by morzh - 12-17-2020, 06:53 PM
RE: Philco 20 - next project - by rfeenstra - 12-18-2020, 12:57 AM
RE: Philco 20 - next project - by rfeenstra - 12-18-2020, 01:26 PM
RE: Philco 20 - next project - by Phlogiston - 12-18-2020, 02:54 PM
RE: Philco 20 - next project - by rfeenstra - 12-18-2020, 06:32 PM
RE: Philco 20 - next project - by Phlogiston - 12-19-2020, 12:28 PM
RE: Philco 20 - next project - by rfeenstra - 12-19-2020, 02:28 PM
RE: Philco 20 - next project - by Phlogiston - 12-19-2020, 02:57 PM
RE: Philco 20 - next project - by rfeenstra - 12-20-2020, 12:10 AM
RE: Philco 20 - next project - by rfeenstra - 12-20-2020, 12:58 AM
RE: Philco 20 - next project - by rfeenstra - 12-23-2020, 12:47 AM
RE: Philco 20 - next project - by rfeenstra - 12-26-2020, 03:39 PM
RE: Philco 20 - next project - by MrFixr55 - 01-11-2021, 07:59 PM
RE: Philco 20 - next project - by morzh - 01-11-2021, 08:08 PM
RE: Philco 20 - next project - by rfeenstra - 01-11-2021, 10:33 PM
RE: Philco 20 - next project - by rfeenstra - 01-11-2021, 10:42 PM
RE: Philco 20 - next project - by morzh - 01-11-2021, 10:42 PM
RE: Philco 20 - next project - by rfeenstra - 01-11-2021, 10:53 PM
RE: Philco 20 - next project - by fenbach - 01-12-2021, 12:00 AM
RE: Philco 20 - next project - by morzh - 01-12-2021, 12:08 AM
RE: Philco 20 - next project - by fenbach - 01-12-2021, 12:30 AM
RE: Philco 20 - next project - by rfeenstra - 01-12-2021, 10:31 AM
RE: Philco 20 - next project - by morzh - 01-12-2021, 11:05 AM
RE: Philco 20 - next project - by Paul Philco322 - 01-12-2021, 12:48 PM
RE: Philco 20 - next project - by morzh - 01-12-2021, 02:00 PM
RE: Philco 20 - next project - by rfeenstra - 03-18-2021, 11:25 PM
RE: Philco 20 - next project - by morzh - 03-19-2021, 03:33 PM
RE: Philco 20 - next project - by rfeenstra - 03-19-2021, 06:50 PM
RE: Philco 20 - next project - by morzh - 03-19-2021, 07:57 PM
RE: Philco 20 - next project - by rfeenstra - 03-19-2021, 11:39 PM
RE: Philco 20 - next project - by morzh - 03-20-2021, 12:11 AM
RE: Philco 20 - next project - by rfeenstra - 03-20-2021, 08:54 AM
RE: Philco 20 - next project - by morzh - 03-20-2021, 04:05 PM
RE: Philco 20 - next project - by Arran - 03-20-2021, 09:54 PM
RE: Philco 20 - next project - by morzh - 03-20-2021, 10:56 PM
RE: Philco 20 - next project - by MrFixr55 - 04-02-2021, 08:12 PM
RE: Philco 20 - next project - by rfeenstra - 04-03-2021, 12:28 PM
RE: Philco 20 - next project - by mikethedruid - 04-03-2021, 05:59 PM
RE: Philco 20 - next project - by rfeenstra - 04-03-2021, 08:23 PM
RE: Philco 20 - next project - by rfeenstra - 02-04-2022, 04:30 PM
RE: Philco 20 - next project - by Brad Winder - 02-05-2022, 02:01 PM
RE: Philco 20 - next project - by Ron Ramirez - 02-05-2022, 03:26 PM
RE: Philco 20 - next project - by rfeenstra - 02-05-2022, 05:10 PM
RE: Philco 20 - next project - by radiorich - 02-05-2022, 05:55 PM
RE: Philco 20 - next project - by Paul Philco322 - 02-05-2022, 06:09 PM
RE: Philco 20 - next project - by Ron Ramirez - 02-05-2022, 07:09 PM



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