17C9 tube in a Philco?? - Page 2 - Videokarma.org TV - Video

Hemingray · #16 11-18-2008, 03:04 PM

Well, was able to find me a NOS 17C9 on the cheap. When it shows up I'll give er a try.

Hemingray · #17 11-20-2008, 05:55 PM

New tube in, however, FM is still silent. Does anyone have service data for this radio?

Hemingray · #18 03-01-2009, 09:55 PM

Me again. Did someone here have a handful of schematics for radios handy?

toxcrusadr · #19 03-02-2009, 09:55 AM

This would be later production than Bietmans and Riders...might be a Sams folder on it though. What was the model #? If it was in the thread maybe I missed it.

I assume you found a power cord, or do you still need one? If so post a pic or pin spacing measurements.

Hemingray · #20 03-02-2009, 11:30 AM

It's about the same as your standard cheater/radio cord.

The model # is likely on the back, the whole thing almost looked like it had been left in the weather. Tried subbing in a 17EW8 (equiv. of the 12DT8 that the tube label had listed), with no luck.

leadlike · #21 03-02-2009, 12:39 PM

I'm guessing the filament is working and the tube lights up-do you have a VOM to check plate voltage?

toxcrusadr · #22 03-02-2009, 02:11 PM

You could have a burnt resistor, a bad coupling cap in the FM section, a bad antenna connection (probably uses the line cord as an antenna), or an open interstage transformer in the FM section. Or a bad solder joint or PCB trace.

Having fun yet?

I love old radios with FM but they are a PIA to get working right. I got several deaf ones to prove it.

Hemingray · #23 03-02-2009, 05:03 PM

Quote:

Originally Posted by toxcrusadr

You could have a burnt resistor, a bad coupling cap in the FM section, a bad antenna connection (probably uses the line cord as an antenna), or an open interstage transformer in the FM section. Or a bad solder joint or PCB trace.

Having fun yet?

I love old radios with FM but they are a PIA to get working right. I got several deaf ones to prove it.

When switched to FM, there is no sound whatsoever. Not even a crackle.

Quote:

Originally Posted by leadlike

I'm guessing the filament is working and the tube lights up-do you have a VOM to check plate voltage?

Have my DMM, next thing to do is check for plate voltage on the 17C9. Pin 10 of the 17C9 (which is a cathode) is tied right smack into ground. Should a cathode be tied directly to ground like that?

Hemingray · #24 03-02-2009, 08:15 PM

Did a meter test, getting about 102V to the tube, so plate voltage appears to be present. Seem to have a silent lower end of the AM band too.

Hemingray · #25 03-04-2009, 07:33 PM

Well, after slipping a 12BA6 into the circuit (some fool had crammed a 12BE6 in there.), the FM band magically sprang to life on me. Now I have a better clockradio to get me up in the mornings

The 17C9 apparently belongs where it is, as FM is working fine with it. So mine has an incorrect tube layout. Anyone happen to have one of the little front knobs for it? The one on the Sleep timer is missing.

leadlike · #26 03-04-2009, 11:44 PM

Glad to hear it is working! To answer your one question, yes, some radio cathodes are tied to ground. As for those troubling dinky knobs, this guy makes 'em:

http://www.renovatedradios.com/clock_knobs.html

I you have any matching knobs on your set, you may try casting a new one in epoxy as well.

Is your am band still getting quiet on the lower end?

Hemingray · #27 03-05-2009, 07:50 AM

Quote:

Originally Posted by leadlike

Glad to hear it is working! To answer your one question, yes, some radio cathodes are tied to ground. As for those troubling dinky knobs, this guy makes 'em:

http://www.renovatedradios.com/clock_knobs.html

I you have any matching knobs on your set, you may try casting a new one in epoxy as well.

Is your am band still getting quiet on the lower end?

It is, yes. Not gonna worry too much about that at this time as for getting up for work in the mornings, I'll wake up to a good local 90s station.