GE H-77 revisited

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GE H-77 revisited

Post by terrydec on Mon Dec 05, 2016 11:23 pm

The radio looks good and sounds great. I'll post a photo if I remember how. My friend thought it was an FM radio because it sounded so good. Not only that but there is a retro radio station in town. WAKY. This same station was on the air when I was a kid and they have the same format and songs of that era. I am actually listening to it a lot.

Now- that said...After the radio is on for awhile there will be a soft pop and the volume cuts in half. This is the interesting part, it comes back slowly. It might do this two or three times in an hour. Before I dig back into this monster it would be nice to know where I'm going.

Any suggestions would be appreciated.

Terry
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Re: GE H-77 revisited

Post by Bill Cahill on Tue Dec 06, 2016 12:01 pm

It could be a tube shorting intermittently, a dirty socket, a bad I F transformer, especially it they are miniature with the capacitors built into The base, or, even a bad resistor.
Hope this helps.

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Re: GE H-77 revisited

Post by John Bartley on Tue Dec 06, 2016 12:33 pm

What Bill said .... I had a set once that had the fading, but it accompanied by a crackling sound that increased until the audio went out, then came back faintly as the set came back to life. I first suspected the silver migration problem with an IF Xfrmr, but it turned out to be a defective screen resistor on an audio output tube. As I recall I found that one using a freeze spray.

cheers

John

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Re: GE H-77 revisited

Post by terrydec on Tue Dec 06, 2016 1:25 pm

Both great suggestions. It could also be the band switch. It is scratchy. I hate switches, especially push buttons.

I can not believe how great this set sounds. It has a two stage audio output, a 4 position tone switch and a 12" speaker.
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Re: GE H-77 revisited

Post by terrydec on Sat Dec 17, 2016 4:32 pm

While I was out walking the dog the set lost the signal. Nothing across the dial. I hate that. The AF section works fine. This thing is a real bear to work on. You have to remove the "Beam -O-Scope" antenna and put it on the bench, plus the chassis is as big as my truck.

The good part? At least it is no longer intermittent. Surprised
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Re: GE H-77 revisited

Post by Bill Cahill on Sat Dec 17, 2016 7:16 pm

Oh, Oh. GE's usually have to be fine tunned on antenna in the cabinet.

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Re: GE H-77 revisited

Post by terrydec on Sat Dec 17, 2016 7:28 pm

Not in this case. That's how I got it working the last time. I guess it's time for the cold spray. I just wish I had been here when it went out. I was outside for 10 minutes and it quit. There are two things I hate, distortion and stuff that don't work right.
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Re: GE H-77 revisited

Post by terrydec on Sat Dec 17, 2016 7:34 pm

John Bartley wrote:What Bill said .... I had a set once that had the fading, but it accompanied by a crackling sound that increased until the audio went out, then came back faintly as the set came back to life. I first suspected the silver migration problem with an IF Xfrmr, but it turned out to be a defective screen resistor on an audio output tube. As I recall I found that one using a freeze spray.

cheers

John

Nobody is going to believe it but I once repaired silver migration. I took the can apart, drilled out the trimmers and replaced them with fixed caps. They worked great, at least when I finally connected the oscillator coil leads right.

Yep, a can of freeze is in my future. I really liked having it playing in the living room.
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