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General Electric H-77

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General Electric H-77  Empty General Electric H-77

Post by terrydec on Sat Mar 03, 2018 4:05 pm

Sherlock Holmes said, "When you remove the impossible, what's left, no matter how improbable, is the answer."

I spent a lot of time restoring and repairing this nice console radio.  I got it working, but one day it just stopped.  All of my tests ended up at the converter tube, 6SA7.  However, that was a NOS tube I got from eBay, so it couldn't be bad.  Today I dug deep in my closet and pulled out my old tube tester.  When I went to check the amp function, it was stone cold dead. I did not see that coming!  I just ordered a replacement.  Another NOS, (I hope).

General Electric H-77  Dsc00610
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General Electric H-77  Empty Re: General Electric H-77

Post by terrydec on Fri Mar 09, 2018 12:55 am

Oops.  It wasn't the tube.   Arrgghh!!  I hate this!  Sad Sad
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Post by terrydec on Fri Mar 09, 2018 8:29 pm

Hint- Test ALL of the tubes.
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General Electric H-77  Empty Re: General Electric H-77

Post by Bill Cahill on Sat Mar 10, 2018 7:32 pm

Guys, I moved this topic to radios because that's what it's about. I left a shadow in clubhouse for easy finding.
Bill Cahill

Very interesting project.
question; Did you mean 5Y3? The tube you mentioned uses a four pin socket.

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Post by terrydec on Sat Mar 10, 2018 11:08 pm

I think the problem is the 6SK7 IF amplifier. It didn't pass the tube tester test. I've ordered a couple from eBay. I am REALLY dedicated to getting this working. I have put a LOT of time and effort into it, plus a lot of money.
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Post by terrydec on Mon Mar 12, 2018 4:46 pm

IT WORKS!!!!!
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General Electric H-77  Empty Re: General Electric H-77

Post by terrydec on Mon Mar 12, 2018 8:52 pm

Now I have a spare 6SA7 and 6SK7. Good.

Let me repeat myself----
IT WORKS!!
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General Electric H-77  Empty Re: General Electric H-77

Post by Tony V on Mon Mar 12, 2018 10:02 pm

Awesome!
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Post by Bill Cahill on Tue Mar 13, 2018 1:03 am

Congradulations!!! Glad to hear it..............

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Post by terrydec on Tue Mar 20, 2018 1:23 am

You won't believe this-

My friend in California just bought this radio for $300 plus shipping. I'm gonna miss it. Obviously I have to ship it by truck. If anybody has any good suggestions in this direction, I would really appreciate it.

$300. Wow!
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Post by terrydec on Wed Mar 21, 2018 11:47 pm

What would cause hum only when a station is tuned in? This is before the volume control. In between stations the set is virtually silent.
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General Electric H-77  Empty Re: General Electric H-77

Post by terrydec on Wed May 23, 2018 12:01 am

I love this set.
(More like love/hate.)
It has developed a new problem.  For awhile, mostly when it first turns on, the sound will be muted.  When I switch the bandswitch back and forth, it comes back.  I have to do this two or three times, then it plays fine.  I don't think it's the switch, but I'm going to let it ride for awhile.  I've already rebuilt the front end.  I can live with getting up to flip the switch.
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Post by Tony V on Wed May 23, 2018 1:05 pm

The bandswitch might be dirty and may need to be cleaned.
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Post by terrydec on Wed May 23, 2018 2:36 pm

Tony V wrote:The bandswitch might be dirty and may need to be cleaned.

That's probably true.
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Post by terrydec on Sat Jun 02, 2018 11:30 pm

The never ending story-

I drug the thing out of the cabinet again, which always includes the "Beam-o-scope." It has push buttons. I hate push buttons. It has five presets, which I actually tried to set once. Good luck. A TV/Phono button and a bandswitch. There is either a dirty contact or weak leaf somewhere. And of course it is intermittent. I really hate that. When I press any other switch and back to manual, it works. Arrrggghh.
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General Electric H-77  Empty Re: General Electric H-77

Post by terrydec on Sat Jul 14, 2018 6:28 pm

Update-

It's still working. The intermittent problem is better. The set usually stays on after an hour or so. I listen to it all the time. With a hi-fi 6Y6 output, and 10" speaker, it sounds really great. It has been a frustrating, but interesting, project.
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Post by Bill Cahill on Sun Jul 15, 2018 1:35 am

Or, bad rubber wirring??? GE used a lot of rubber, including in those shields. Wires in shields are all replaceable. I've done it. The push button tuning is critical in GE's. It must be set up in the cabinet as from the factory. Positions are critical.

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General Electric H-77  Empty Re: General Electric H-77

Post by terrydec on Sun Sep 09, 2018 12:02 am

This is notable, so I thought I would post it.  I'm confined to my living room for a while, so I have been playing this radio, a lot.  It regularly stays on overnight because I fall asleep listening to it.  Lucky for me there is a great AM station that plays music from the 50s to 70s. WAKY.  There is a great story about WAKY, but that's for another time.

It will still mute a couple of times in the first hour of being turned on, but then the problem disappears.  This set sounds so good that people think it's FM.

I was living with a bad buzz in the signal.  I thought it was interference from somewhere, but I turned off everything I could think of.  Finally, the power went out in the kitchen.  I didn't even think of the light over the sink.  Problem solved.

I'll admit, I'm really proud of the work I put into this set.  It took me over a year to get it working right.  Many thanks for everybody's thoughts and suggestions.

BTW- I'm of the school that believes you should leave stuff on all the time.  Some people disagree.  I think it's a greater shock to turn it on and off, than let it cruise along.
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General Electric H-77  Empty Re: General Electric H-77

Post by terrydec on Sun Oct 14, 2018 2:20 pm

Update- The stupid pilot lamps have gone out. I think this set has gremlins. Not serious enough to pull the thing apart, though.
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Post by terrydec on Thu Nov 22, 2018 6:29 pm

This radio should have its own Facebook page---
A couple of weeks ago it started sounding distorted, so I shut it down.  Just for kicks today I turned it on.  The lights came on and it is playing great.  Go figure.  Just in time for my birthday.

This radio definitely has a mind of its own.Shocked
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General Electric H-77  Empty Re: General Electric H-77

Post by Bill Cahill on Mon Nov 26, 2018 6:54 pm

May be a poor connection in lamp socket. Could even be corrosion on light bulb.
And, by the way. Power transformer sets, and, even series string sets to a degree, were never made, nor, meant to play 24x7. Some plastics dis color, over-heat, even melt from that much heat... I've even seen heat cracks, even in bakelite...

Hope this helps..
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General Electric H-77  Empty Re: General Electric H-77

Post by terrydec on Mon Nov 26, 2018 7:18 pm

I don't really play it more than a few hours a day. I'm sure that the lamps are, as you say, just intermittent. I'm not going to pull the thing apart, (a very big deal), just for that. I'm mostly posting this as a comment, not complaint. It does sound great. However, thanks for the interest and comments.
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General Electric H-77  Empty Re: General Electric H-77

Post by terrydec on Thu Feb 28, 2019 2:38 pm

Update:
First of all, I got new #44 dial lamps. I was able to replace them without pulling the chassis. It really lights up the face plate.

I'm going to pull it apart again to reattach the face plate, which has become separated from the cabinet and is rubbing against the dial pointer. While it's out, I intend to replace all the capacitors that I haven't so far. (I'm lazy, and these are all hard to get to.) I'm also going to try and pinpoint why it mutes the signal. Hopefully it'll be one of the caps.

More later.
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