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

37-650 (37-3650 Canada) Volume Fade
#1

I recapped this radio except for the #6 and #13 (buried in the RF Chassis), put it back together and it played like a dream....then about 5 minutes later the volume faded out.  I'm pretty new to this so can someone tell me if either cap could be the problem?  I didn't do them because I was a bit intimidated by removing the RF chassis to dig them out.  I'd hate to go through what appears to be a lot of work and room for error just to find nothing changes when and if I get it back together properly.

Thanks.

Glenn
#2

Faded out sounds like tube problems. Check you voltages and look for bad tubes. Could even be a loose socket pin connection.

!!!!!!!!!!!!!!!!!!!RESISTANCE IS FUTILE!!!!!!!!!!!!!!!!!!!!!!  
                           /\/\/\/\/\/\/\/\/\
                                                     
                                 [Image: http://philcoradio.com/phorum/images/smi...on_eek.gif]  Chris
#3

Chris:

Being the type inclined to do the least work possible, which prompted my post in the first place, I decided to take your advice to replace tubes. The 6K7 and 6A8 seemed to be the likely candidates. I had done this one before with no change but your advice made me question the tubes I'd chosen as I had just pulled them out of a bin of untested, used tubes. I do not have a tube tester and simply use a meter to make sure I have continuity on the heater pins. This time around I took them from a known good radio starting with the 6K7. Bingo, I played the radio for more than an hour with no fade. This has saved me a ton of unnecessary work had I dived into the sub-chassis.

Thanks Chris, your reply ignited the spark I needed to question my choice of replacements!

Glenn




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Need Help to ID this radio 11 tube Philco
Welcome to the Phorum, Ken! Lots of help here for all of your restoration questions. Take care and BE HEALTHY! - Gar...GarySP — 07:59 PM
Need Help to ID this radio 11 tube Philco
Thank you. I went to your online library and found 2 schematics. I will download and compare to components!Ken D. — 06:31 PM
Need Help to ID this radio 11 tube Philco
It is a 16B tombstone.morzh — 06:13 PM
Zenith H725
David - sorry, I reread your post and finally saw THD - now the % figures make sense. Thanks for explaining. The PSU...EdHolland — 06:06 PM
Need Help to ID this radio 11 tube Philco
Hi Everyone, New member but have been reading this for awhile for tips! Vaccum tubes were before my time so bear with ...Ken D. — 06:03 PM
My Philco 37-116 Restore
Thank you MrFixR55, I appreciate your comments very much. I do not detect much hum if any so I will be staying with the ...dconant — 05:15 PM
My Philco 37-116 Restore
Hi DConant Yes, you can replace chokes with resistors.  You do stand the risk of increased hum.  the solution is to inc...MrFixr55 — 04:23 PM
Zenith H725
1.7-3.9 %, a modified Sine wave inverter is around 25%. Most generators from big box stores run 10% at a 50% load. What ...David — 04:06 PM
My Philco 37-116 Restore
I am having a heck of a time doing the alignment on the AM band. I can't seem to dial in the 1500 KC oscillator. I can h...dconant — 03:35 PM
Zenith H725
David - I think I understand but what units are you discussing (Low of 1.7, high of 3.9)? Budget constraints for Ham ...EdHolland — 01:43 PM

[-]
Who's Online
There are currently 730 online users. [Complete List]
» 2 Member(s) | 728 Guest(s)
AvatarAvatar

>