Repairing Top Cap on Tube

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Repairing Top Cap on Tube

Post by nytuberadio on Wed Apr 06, 2011 12:34 am

I bought a 1939 GE portable with 4 1 volt tubes one of the had the metal cap off. One friend recomended cleaning the wire and tintiing it and heating the cap to rejoin it. I assume you also want to glue it back in place. Would this a good thing the tube is a 1N5

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Re: Repairing Top Cap on Tube

Post by sprman on Wed Apr 06, 2011 8:04 pm

Tin it solder it.Most glues will not work if the tube gets very hot.Iforget but 1 glue works very good.Try gorrila glue or superglue..Sprman : )

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Re: Repairing Top Cap on Tube

Post by Resistance is Futile on Wed Apr 06, 2011 11:27 pm

I have read the super glue may break the glass, expansion during heat maybe?
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Re: Repairing Top Cap on Tube

Post by nytuberadio on Thu Apr 07, 2011 12:39 am

Group
The 1N5 in a battery set doesn't produce any heat when its working, it doesn't glow!!! Very Happy

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Re: Repairing Top Cap on Tube

Post by fifties on Sat Apr 09, 2011 4:32 am

Actually you CAN get one volt filament tubes to produce a dim glow.
I've done it in one of my battery sets, by using two D cells wired in parallel, to double the current, and in the dark, they glow, lol.
Of course they don't heat up, so using glue would not be consequential in causing damage.
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Re: Repairing Top Cap on Tube

Post by Tony Wells on Sat Apr 09, 2011 12:43 pm

Some advocate furnace cement for that. A drop of Elmers white would probably hold forever on a battery set tube.

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Repairing Top Cap on Tube

Post by nytuberadio on Sat Apr 09, 2011 3:09 pm

Ok We'll give it a shot of glue. Im bulding a battery eliminator for the b battery and trying 2 Ds for the A.

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Re: Repairing Top Cap on Tube

Post by nytuberadio on Tue Apr 12, 2011 8:12 pm

Gang I did it. Tube tested good after repair. First you tin the wire. Then you super glue the cap to the tube. Next hit the top of the tube with a bit of solder.

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Re: Repairing Top Cap on Tube

Post by GaryRabbitt on Sat Jun 04, 2011 2:22 am

As stated, sometimes superglue can cause a tube to crack. The low voltage types ay hold up though as they don't make much heat.

Of other tubes, I have seen where the glass cracks right around the tube cap, in a nice circle. I don't spuerglue any tubes.
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Gluing grid cap to top of tube

Post by Brig on Wed Feb 08, 2012 7:16 pm

Duco Cement works just fine, and you can buy a generous tube of it for a dollar almost anywhere. I've used it for reattaching tube grid caps for over 20 years and have yet to have one give loose or otherwise fail. It is quick drying and cleans up easily with ordinary nail polish remover (acetone). When I was a kid this stuff was known as "airplane glue" owing to its use in constructing model airplanes.

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