Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 1 Vote(s) - 1 Average
  • 1
  • 2
  • 3
  • 4
  • 5

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



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Part numbers to model cross
I believe there is that document, and I think we might have it in the Library.morzh — 03:29 PM
Philco 42-345 Restoration/Repair
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
Part numbers to model cross
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
Philco 42-345 Restoration/Repair
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
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
Vlad95, Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM
5U4 vs 5Z4 tubes
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
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
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM

[-]
Who's Online
There are currently 959 online users. [Complete List]
» 2 Member(s) | 957 Guest(s)
AvatarAvatar

>