philco 48-1253 - Videokarma.org TV - Video

capbuster · #1 08-05-2010, 06:51 PM

I recapped this set all but one. It is a cap with wire wrapped around it.
Any ideal what it would be. Thanks for any info.

bandersen · #2 08-05-2010, 07:18 PM

Check out this discussion on a Philco 46-420 with coiled capacitor: http://www.videokarma.org/showthread...=245882&page=4

capbuster · #3 08-05-2010, 08:52 PM

Okay . what do you think leave it alone or change it ? The set plays good for about 10 minutes then starts fading out. Or would this be another issue?
Even when i play some records starts fading out. And can a person still get one of theses. or make one. Iknow enough to recapp a set check a few things learning. Thanks Capbuster

bandersen · #4 08-05-2010, 11:29 PM

I suspect it's another issue - something heat related. Perhaps a power resistor is going bad or a leaky capacitor. Have you replaced any ?

I popped out the old cap out of the coil and stuck a new one inside. After reading the comments from more experienced radios guys, I doubt it's necessary at all. It purpose seems to be to filter out noise from a source that no longer exists.

wa2ise · #5 08-06-2010, 12:52 AM

Quote:

Originally Posted by capbuster

Okay . what do you think leave it alone or change it ? The set plays good for about 10 minutes then starts fading out. Or would this be another issue?
Even when i play some records starts fading out.

I doubt that this cap-coil is causing this. Something else is going bad. As you mention it happens to both radio mode and record player mode, I'd look at the circuits used in both modes, namely the audio amp circuits, and the power supply. The radio circuits probably are not causing it. Try measuring various voltages in the set, when first turned on (after the tubes are warmed up, say 20 seconds), and remeasure the same various voltages when the fade out happened. That might tell you what circuit to look at. As someone else mentioned, a resistor may be drifting as it gets warm.

Reece · #6 08-06-2010, 07:38 AM

Not clear from the description but don't overlook that a tube heater may be intermittent and cutting in and out. Do the tubes stay lit when it fades?

capbuster · #7 08-06-2010, 01:11 PM

Ok thanks for the responses . The tubes do stay lit. All the sound in phono & radio gets raspy. Then gets lower. I did recapp all but the wire wound one. I guess look for a resistor in the audio stage? Or just change out all of them? This set is real confined hard to get to anything on the bottom end. tight , tight whole lot tight.lol.

Reece · #8 08-06-2010, 04:10 PM

Do you have another first audio and audio output tube? If so, try them one at a time.

Just replace that capacitor and forget the wire coil on it, or do as suggested and put the new cap inside the old coil.

Don't replace all the resistors. Try this: get a can of computer keyboard cleaning "air." Turn the chassis over and turn on the radio. Wait for the sound to go bad.

Turn the can of "air" upside down and use the extension tube. Upside down it will spray cold liquid. Drip some on resistors in the audio and power supply section one by one, get them cold again, see if doing so on a particular one makes the sound come back, then that's the bad resistor.

capbuster · #9 08-06-2010, 07:54 PM

Well that is a neat trick. you must be yogi bear. I will give this a try. i will have to see about a tube. Have a few sets might have one borrow from.
Give me few days let you all know.

Reece · #10 08-07-2010, 07:33 AM

Yogi I ain't, just a turnip that fell off the truck a long time ago and they left me here and never came back.

BTW while you're at it, the upside-down can trick is good for freezing off skin tags and warts and such. And it stings like heck. It's like absolute zero. Good stuff. Fix your radio and avoid the dermatologist at the same time.

VintagePC · #11 08-07-2010, 07:37 AM

Quote:

Originally Posted by Reece

Yogi I ain't, just a turnip that fell off the truck a long time ago and they left me here and never came back.

BTW while you're at it, the upside-down can trick is good for freezing off skin tags and warts and such. And it stings like heck. It's like absolute zero. Good stuff. Fix your radio and avoid the dermatologist at the same time.

DAMMIT... here we already have ID checks when you buy it b/c of idiots huffing it... now they're gonna ask for your dermatologist's license too

capbuster · #12 08-07-2010, 09:12 PM

Well this is going to take awhile. This set is crowded. Going to have to take some caps back out so i can get to resistors. It is only about 5 inches wide by
about 16 inches wide 6 inches deep. Full of stuff. Oh well be a adventure.

Reece · #13 08-08-2010, 07:18 AM

The first suspicion is in resistors in the audio and power supply section. Don't take any caps out: just bend them to one side. You should be able to ohm them out and then with the set playing snorkle the coldspray tube to them. Besides, if you took them out, how would you get the set to play?

capbuster · #14 08-08-2010, 06:34 PM

Well i was going to go ahead and replace all. But i will try your method.
Seems smarter . Thanks Cap buster

vintageguy · #15 08-08-2010, 09:12 PM

Good luck on your 48-1253. I just restored my mother's 48-1253 and it turned out great...left that choke in place with no problems. Just a recap and new output tube, were all that was required. Wondering how your record changer is working? Mine tends to pull the tonearm across the record surface just a fraction too soon...that is, before the needle clears the record surface, completely. I therefore get a slight rip (no damage to record), about 50% of the time. Have you had a similar issue?