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

40-180 Voltage High
#1

This is my first post after searching other posts for answers and came to a wall in my 40-180 restore. A short history of events:

I salvaged it from the landfill in 1960 and it worked very good, yes I was 9 years old. Not used in the last 10 years but always in the house. Moved it to the family retreat and decided it was time to get it working on weekends. At this point lots of humming and one faint station received. Took the chassis to an Amp shop to test the tubes and he replaced the two e-caps and gave me spare tubes ($200 ouch). Still the same hum so I started studying what needed to be done and replaced all paper caps (and the e-caps with the correct value) and most resistors myself. Now no hum, no anything so I tested voltages and all tested good until I got to RF 1232/7G7 and they were very low so I stopped for that weekend thinking it would be easy to track down an error I may have made next trip. Came back this next weekend and the voltages are way off everywhere.

So what could have gone wrong while just sitting and where do I start now? I have linked a picture of the chassis upside down behind the console where it is plugged into the field coil and also a marked up diagram of the voltages from the last trip. Circled part numbers have been replaced or different values noted.

<!-- m --><a class="postlink" href="http://farm5.static.flickr.com/4017/4473835437_82c1eea555_b.jpg">http://farm5.static.flickr.com/4017/447 ... a555_b.jpg</a><!-- m -->
<!-- m --><a class="postlink" href="http://farm5.static.flickr.com/4049/4473836183_e32584d724_b.jpg">http://farm5.static.flickr.com/4049/447 ... d724_b.jpg</a><!-- m -->


Messages In This Thread
40-180 Voltage High - by Bruce C - 03-29-2010, 05:20 PM
Re: 40-180 Voltage High - by DeckApe - 03-30-2010, 09:36 AM
Re: 40-180 Voltage High - by Bruce C - 03-30-2010, 10:48 AM
Re: 40-180 Voltage High - by rghines1 - 03-30-2010, 05:48 PM
Re: 40-180 Voltage High - by Bruce C - 03-30-2010, 07:18 PM
Re: 40-180 Voltage High - by rghines1 - 03-31-2010, 04:58 PM
Re: 40-180 Voltage High - by Bruce C - 03-31-2010, 10:32 PM
Re: 40-180 Voltage High - by Bruce C - 04-04-2010, 07:16 PM
Re: 40-180 Voltage High - by rghines1 - 04-05-2010, 08:47 AM
Re: 40-180 Voltage High - by Bruce C - 04-05-2010, 07:34 PM
Re: 40-180 Voltage High - by exray - 04-05-2010, 10:40 PM
Re: 40-180 Voltage High - by Raleigh - 04-05-2010, 10:59 PM
Re: 40-180 Voltage High - by exray - 04-05-2010, 11:26 PM
Re: 40-180 Voltage High - by codefox1 - 04-06-2010, 02:12 PM
Re: 40-180 Voltage High - by Bruce C - 04-06-2010, 05:08 PM
Re: 40-180 Voltage High - by Bruce C - 04-20-2010, 05:47 PM
Re: 40-180 Voltage High - by Bruce C - 04-26-2010, 05:36 PM
Re: 40-180 Voltage High - by Ron Ramirez - 04-26-2010, 05:51 PM
Re: 40-180 Voltage High - by denver - 04-26-2010, 07:28 PM
Re: 40-180 Voltage High - by Bruce C - 04-30-2010, 01:35 PM
Re: 40-180 Voltage High - by exray - 05-01-2010, 02:36 AM
Re: 40-180 Voltage High - by Bruce C - 05-07-2010, 11:03 AM
Re: 40-180 Voltage High - by codefox1 - 05-08-2010, 10:45 AM
Re: 40-180 Voltage High - by Raleigh - 05-12-2010, 02:09 PM
Re: 40-180 Voltage High - by Bruce C - 05-12-2010, 08:06 PM
Re: 40-180 Voltage High - by Bruce C - 05-12-2010, 08:06 PM
Re: 40-180 Voltage High - by Bruce C - 05-12-2010, 08:06 PM



Users browsing this thread: 7 Guest(s)
[-]
Recent Posts
New member
Hello jeff, Welcome aboard ! Sincerely Riochardradiorich — 06:53 PM
New member
Good picture, When was it taken? You don't look in it like a guy who has a teenage son :)morzh — 06:13 PM
New member
Love the pic! I'm southern IL, so wouldn't be much help and Bob Anderson is very good on those, but lives in Chicago are...TV MAN — 05:25 PM
Philco 40-120C Filament Wiring
:thumbup:klondike98 — 04:56 PM
Philco 40-120C Filament Wiring
With these values I think you are OK; the Cmax for this tube is 40uF. Your Vbb could rise a bit, but probably not too mu...morzh — 04:53 PM
Philco 40-120C Filament Wiring
BTW, someone had replaced the original 20uF/20uF filter cap with a 47uF/33uF cap. Do you think these values are safe on ...bluecap — 04:33 PM
Philco 40-120C Filament Wiring
You're correct. I was misinterpreting the key position. I now know where it is, and things are making sense. I appreciat...bluecap — 04:29 PM
Philco 40-120C Filament Wiring
I think Morzh has a good thought. Check the key position. The under chassis diagram in the Philco info shows an “H” for ...klondike98 — 04:25 PM
Philco 630csx power cord
Yes, the third wire goes to the stud on the side and is separate from the other two. I've usually used cloth covered ...Tynwald — 03:09 PM
New member
Have you tried Alabama Historical Radio Society? They possibly could recommend someone. I remember a name of Dee Hanes...morzh — 03:08 PM

[-]
Who's Online
There are currently no members online.

>