Home » Audio » Radio » philco model 111 (reception fades out)
philco model 111 [message #62341] Mon, 12 April 2010 20:19 Go to next message
capbuster is currently offline  capbuster
Messages: 51
Registered: April 2010
Location: wise va. U.S.A.
Baron
Ihave a philco model 111 .Recapped all new resisters ,all good tubes , antenna coils check good . After about 15 minutes looses reception. Turn off let cool does it again. Ran a long wire antenna
picks up stations . What would make this happen ? Acts like something gets hot quits working. I watched tubes no filaments cutting out. DO NOT KNOW WHAT TO CHECK .
Thanks Capbuster. Rolling Eyes Razz
Re: philco model 111 [message #62342 is a reply to message #62341] Mon, 12 April 2010 20:41 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

Swap all the capacitors with polypropylene caps, and I'll bet that fixes it. Old radios actually are more likely to have bad caps even than tubes.

Re: philco model 111 [message #62344 is a reply to message #62342] Tue, 13 April 2010 20:00 Go to previous messageGo to next message
capbuster is currently offline  capbuster
Messages: 51
Registered: April 2010
Location: wise va. U.S.A.
Baron
Did replaced all . Every resister . Checked tubes . Didnt replace mica caps . AllREADING I DONE SAID THEIR RELIABLE . What does anyone think.
THANKS FOR REPLY Capbuster. Rolling Eyes Razz
Re: philco model 111 [message #62346 is a reply to message #62344] Tue, 13 April 2010 21:13 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

Have you replaced all the other capacitors? Are there any electrolytic or paper capacitors? Mica and ceramic capacitors are reliable, you're right, but electrolytic and paper caps are extremely unreliable and almost every old radio has them.

Also note that molded paper capacitors can look like dominoes just like some mica caps do. If a capacitor is specifically labeled "mica" then I'd be comfortable with it but if it looks like a domino, I wouldn't be.

Re: philco model 111 [message #62351 is a reply to message #62346] Wed, 14 April 2010 18:37 Go to previous messageGo to next message
capbuster is currently offline  capbuster
Messages: 51
Registered: April 2010
Location: wise va. U.S.A.
Baron
Yes did replace electrolytic caps. all other caps. will check to see if any are not micas . BUT PRETTY SURE THEY ARE.
Thanks for reply .
Capbuter
Make Your Own IF Transformers [message #62352 is a reply to message #62351] Wed, 14 April 2010 22:33 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

I've also had those symptoms once from a bad IF transformer. In that case, the capacitor in the can was fine but the insulation had evidently broken down in a weird way. I'm not sure what caused it, because it was magnet wire, but if you measured it hot it measured very different than it did cold. I expect some slight shift, but what it had was way too much.

If it turns out this has happened to your radio too and if you can't find a replacement, check this page:

Re: philco model 111 [message #62359 is a reply to message #62341] Thu, 15 April 2010 19:04 Go to previous message
capbuster is currently offline  capbuster
Messages: 51
Registered: April 2010
Location: wise va. U.S.A.
Baron
Will check . Thanks alot. Smile
Capbuster.
Previous Topic: Montgomery Ward Airline parts?
Next Topic: Any advice on long wire antenna
Goto Forum:
  


Current Time: Fri Mar 29 02:51:49 CDT 2024

Sponsoring Organizations

DIY Audio Projects
DIY Audio Projects
OddWatt Audio
OddWatt Audio
Pi Speakers
Pi Speakers
Prosound Shootout
Prosound Shootout
Smith & Larson Audio
Smith & Larson Audio
Tubes For Amps
TubesForAmps.com

Lone Star Audiofest