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

41-81 AVC Problem?
#1

Last week I finished work on a 41-81 portable. I think I may have a problem with the AVC, unless maybe it just isn't supposed to work too well on this simple radio. Far away stations come in quite weakly, though I can listen to them easily by turning up the volume. Strong, nearby stations are so strong that I can hear them easily even with the volume all the way down.

I replaced all of the tubular caps, and I'm sure I replaced the resistors in the AVC circuit (a 4.7 meg and a 10 meg.) There is a 250 mmf mica in the AVC that I did not replace. I think this one bypasses what's left of the RF to ground after the detector diode and before both the volume control and the AVC.

Before I tear into it again, does it seem to anyone that the 250 mmf mica is suspect? Or should I just not expect too much from this simple, 4 tube radio? I have other old portables that don't have great AVC either, but on a modern Walkman-type, the distant and strong stations come in at about the same volume. The noise level is higher on the more distant station, as one would expect.

Any other suggestions? I can't find any other components in the AVC that I did not replace, unless it is the IF transformers.

John Honeycutt


Messages In This Thread
41-81 AVC Problem? - by Raleigh - 06-07-2010, 12:09 AM
Re: 41-81 AVC Problem? - by codefox1 - 06-07-2010, 10:28 AM
Re: 41-81 AVC Problem? - by 7estatdef - 06-07-2010, 09:19 PM
Re: 41-81 AVC Problem? - by Raleigh - 06-18-2010, 02:02 PM
Re: 41-81 AVC Problem? - by rghines1 - 06-19-2010, 02:14 PM
Re: 41-81 AVC Problem? - by Chuck Schwark - 06-19-2010, 06:23 PM
Re: 41-81 AVC Problem? - by Raleigh - 06-21-2010, 09:52 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco model 38 code 121 not receiving signal.
Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM
Testing a speaker and output transformer Trutone A2-G
morzh Short-circuited turns can be considered as a half-dead transformer. But on this case transformer will hot and s...Vlad95 — 11:01 AM
Testing a speaker and output transformer Trutone A2-G
I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM
Philco model 38 code 121 not receiving signal.
Good news everyone! I think I have found everything I need for rewinding the antenna coil primary. I found some pla...Stormlord5500 — 09:40 AM
Philco Battery-WWII vintage
My younger sister went to SUNY Plattsburg NY, (BS, MS, RN) in the late 1970sabout 10 min from the Northern NY / Canada b...MrFixr55 — 07:59 AM
Philco Battery-WWII vintage
Hello Bob, What Amazing find! Sincerely Richardradiorich — 10:19 PM
Testing a speaker and output transformer Trutone A2-G
Hi Murf, Do this: Monitor between ground and one plate of the rectifier while playing the radio.  Do the same with ...MrFixr55 — 09:51 PM
Philco Battery-WWII vintage
Mike; I take it that Soviet cars did not come equipped with block heaters, hence the hot oil change? Where I lived in...Arran — 08:42 PM
Philco 42-345 Restoration/Repair
The more the better. (Within reasonable limits.) 2-5 times more is no problem in this case.Vlad95 — 03:50 PM
Philco 42-345 Restoration/Repair
Thanks, RodB and Vlad95, I was mainly trying to figure out this capacitor to locate a replacement, Vlad thank you for...osanders0311 — 03:44 PM

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

>