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: 1 Guest(s)
[-]
Recent Posts
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
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM
5U4 vs 5Z4 tubes
5U4 and 5Z4 almost identical. I think nothing happened if you left 5U4 instedad 5Z4 long time. Just heater current 5U4 ...Vlad95 — 11:02 PM
Philco 42-345 Restoration/Repair
Hello Vlad95 , Very Funny ! Sincerely Richardradiorich — 11:01 PM
Philco 42-345 Restoration/Repair
RodB You are European yourself   :evil: I'm Canadian for the last 30 years  :snowman: But not Yankee  :lol: Vlad95 — 10:49 PM
Philco 42-345 Restoration/Repair
The band switch selects different oscillator coils for the band selected. I would look for a bad connection in the switc...RodB — 10:31 PM
Philco 42-345 Restoration/Repair
Hang in there...PaulPaul Philco322 — 09:30 PM

[-]
Who's Online
There are currently 1048 online users. [Complete List]
» 2 Member(s) | 1046 Guest(s)
AvatarAvatar

>