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

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco 37-640
#46

Well, the speaker works fine, and the final amp works fine. I DID have to reverse the connections to the hum bucker coil, but that was easy enough. I know the speaker works from injecting an audio signal at C44. I don't, however, have anything coming from the 2nd detector / 1st audio, so I am going to have to trace out things there. That will be a bit of a pain since to even get at that tube base I will have to remove a lot of the new condensers I put in. I think I will probably just strip out everything on that side, the IF amp and 2nd detector / 1st audio, and rewire everything, carefully making sure everything goes where it should. I did try injecting the audio at the volume control, but got nothing, so I know something is screwed up there. In good news, all the tubes lit up OK, no explosions, no smoke, no smell of something overheating, so things could be worse. I know that the filament wiring is all OK, and that I have good B+. This radio is definitely the biggest pain in the butt I have had to tackle so far.


Messages In This Thread
Philco 37-640 - by mikethedruid - 01-27-2020, 05:03 PM
RE: Philco 37-640 - by morzh - 01-27-2020, 05:23 PM
RE: Philco 37-640 - by mikethedruid - 01-27-2020, 06:10 PM
RE: Philco 37-640 - by mikethedruid - 01-27-2020, 09:44 PM
RE: Philco 37-640 - by truePhilco - 01-27-2020, 10:40 PM
RE: Philco 37-640 - by mikethedruid - 01-28-2020, 12:16 AM
RE: Philco 37-640 - by mikethedruid - 01-30-2020, 01:54 AM
RE: Philco 37-640 - by mikethedruid - 01-31-2020, 12:24 AM
RE: Philco 37-640 - by mikethedruid - 02-01-2020, 11:08 PM
RE: Philco 37-640 - by mikethedruid - 02-02-2020, 05:08 PM
RE: Philco 37-640 - by mikethedruid - 02-03-2020, 10:54 PM
RE: Philco 37-640 - by Jake Blake - 02-04-2020, 02:21 PM
RE: Philco 37-640 - by mikethedruid - 02-04-2020, 09:42 PM
RE: Philco 37-640 - by Steve Davis - 02-04-2020, 11:34 PM
RE: Philco 37-640 - by mikethedruid - 02-05-2020, 12:55 AM
RE: Philco 37-640 - by mikethedruid - 02-05-2020, 12:56 AM
RE: Philco 37-640 - by mikethedruid - 02-06-2020, 08:56 PM
RE: Philco 37-640 - by mikethedruid - 02-06-2020, 11:57 PM
RE: Philco 37-640 - by mikethedruid - 02-07-2020, 01:15 AM
RE: Philco 37-640 - by Jake Blake - 02-07-2020, 08:24 AM
RE: Philco 37-640 - by mikethedruid - 02-07-2020, 05:04 PM
RE: Philco 37-640 - by morzh - 02-07-2020, 05:25 PM
RE: Philco 37-640 - by mikethedruid - 02-09-2020, 03:12 PM
RE: Philco 37-640 - by mikethedruid - 02-11-2020, 01:28 AM
RE: Philco 37-640 - by mikethedruid - 02-11-2020, 11:18 PM
RE: Philco 37-640 - by Jake Blake - 02-11-2020, 11:36 PM
RE: Philco 37-640 - by Nathan Slingerland - 02-12-2020, 12:22 AM
RE: Philco 37-640 - by mikethedruid - 02-12-2020, 03:38 PM
RE: Philco 37-640 - by mikethedruid - 02-12-2020, 10:04 PM
RE: Philco 37-640 - by mikethedruid - 02-13-2020, 10:35 PM
RE: Philco 37-640 - by morzh - 02-13-2020, 10:57 PM
RE: Philco 37-640 - by mikethedruid - 02-13-2020, 11:12 PM
RE: Philco 37-640 - by mikethedruid - 02-13-2020, 11:33 PM
RE: Philco 37-640 - by mikethedruid - 02-18-2020, 09:57 PM
RE: Philco 37-640 - by Jake Blake - 02-18-2020, 11:31 PM
RE: Philco 37-640 - by Nathan Slingerland - 02-18-2020, 11:50 PM
RE: Philco 37-640 - by mikethedruid - 02-19-2020, 02:49 AM
RE: Philco 37-640 - by morzh - 02-19-2020, 09:03 AM
RE: Philco 37-640 - by mikethedruid - 02-20-2020, 05:12 PM
RE: Philco 37-640 - by rfeenstra - 02-20-2020, 07:56 PM
RE: Philco 37-640 - by mikethedruid - 02-20-2020, 08:39 PM
RE: Philco 37-640 - by mikethedruid - 02-22-2020, 07:32 PM
RE: Philco 37-640 - by Jake Blake - 02-22-2020, 07:50 PM
RE: Philco 37-640 - by rfeenstra - 02-22-2020, 09:09 PM
RE: Philco 37-640 - by mikethedruid - 03-06-2020, 07:15 PM
RE: Philco 37-640 - by mikethedruid - 03-07-2020, 04:23 PM
RE: Philco 37-640 - by Jake Blake - 03-07-2020, 08:44 PM
RE: Philco 37-640 - by mikethedruid - 03-09-2020, 08:59 PM
RE: Philco 37-640 - by rfeenstra - 03-09-2020, 09:19 PM



Users browsing this thread:
[-]
Recent Posts
Restoration of the Canadian General Electric A-87
Thanks for your help Michael. In fact, this video is only an intermediate result. Later I had to apply another tinting l...RadioSvit — 09:01 AM
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. Search f...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM
Part numbers to model cross
Jim, We have this index put together by Dale Cook but I don't think that is quite what you are looking for. The Parts...klondike98 — 09:37 PM
Philco Model 38-7: what caps & resistors do fail typically?
Yep the dim bulb test is OK but I'd definitely replace all those electrolytics before I did it. Since those #47 conden...klondike98 — 09:18 PM
Philco 42-345 Restoration/Repair
The resistor is a 2.2 Meg, it was the last one I hadn't replaced. The broadcast is coming in after replacing it.osanders0311 — 09:09 PM

[-]
Who's Online
There are currently 1141 online users. [Complete List]
» 1 Member(s) | 1140 Guest(s)
Avatar

>