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 Grid Cap Repair

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criageek
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Join date : 2017-05-07

PostSubject: Grid Cap Repair   May 9th 2017, 6:18 pm

I picked up a Jackson 115 tube tester this weekend. It needed a fair amount of cleanup and the glass in the meter was broken. I was able to remove the meter and disassemble it, remove the broken glass, and replace it with a piece of plexiglas. I learned quickly that if you wipe it to clean it, it will cause the meter to deflect lol.

All that's left is to replace the grid cap wire, which is brittle and cracked. The problem is that the connection to the cap itself is frayed badly so I'm looking for advice for repairing it. I don't see an obvious way to take it apart. Any ideas?

Thanks,
Rich
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Cliff Jones
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Join date : 2010-11-22

PostSubject: Re: Grid Cap Repair   May 9th 2017, 7:54 pm

Look for stranded Teflon wire. It will Handle the heat and voltage. 
I was not aware of the style, before I wrote this so this applies to those that don't have the bakelight holder.

Remove the cap sleeve from the tube slowly so the tube cap has to release its grip otherwise the cement may break its bond on the top of the tube.

You could try a small bladed screwdriver to help break its grip, try not to twist the top sleeve cap as you don't want to break the wire under the tube cap but do not let it touch the glass.
Once you have it off , then desolder the cap sleeve wire removing all solder.
Solder new wire of appropriate length.  Replacing, of course the old brittle wire entirely.

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Last edited by Cliff Jones on May 10th 2017, 2:35 pm; edited 2 times in total
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Cliff Jones
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PostSubject: Re: Grid Cap Repair   May 10th 2017, 2:31 pm

It was solved on an outside forum.

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