Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

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 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM

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

>