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Hints, Tips and Solutions (Do NOT post requests for help here) If you have any useful general hints and tips for vintage technology repair and restoration, please share them here. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 5th Apr 2019, 3:01 pm   #21
wd40addict
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Default Re: Refixing loose valve bases

I had a KT66 with a loose base. I waited for a sunny day, went outside and poured a little meths into the base (with valve upright). Then left it for a few hours.

On my return the valve was solidly re-bonded to the base!

How it works: The meths dissolves the shellac, but then slowly evaporates leaving the shellac bonded in its new location.
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Old 11th Jun 2019, 9:27 pm   #22
vinrads
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Default Re: Refixing loose valve bases

What a good idea. must try it sometime . Mick.
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Old 26th Jun 2019, 12:59 am   #23
whiskas
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Default Re: Refixing loose valve bases

I'll second the use of pound shop 2-part epoxy.
Have manged many successeful base repairs with it myself

By the way, I usually masking tape the areas where I don't want the glue to go, saves a possibly sticky clean up job later!
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Old 26th Jun 2019, 7:57 pm   #24
g4aaw pete
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Default Re: Refixing loose valve bases

One of my CR100s had a 5Z4G with a loose base.
I used 'No Nails'.
Not pretty, but effective. Hasn't cracked the glass yet.
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Old 26th Jun 2019, 11:39 pm   #25
McMurdo
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Default Re: Refixing loose valve bases

I've always used araldite too, also on CRT bases without incident.
However I've come across Serious Glue, its glass-clear, very sticky and goes off quickly (sometimes in the tube!!). Spent ages peeling it off my fingers.

I suppose auto windscreen sealant would be the ideal thing. The downside is that once opened, the tube tends to go off very quickly.
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Old 30th Jun 2019, 6:20 pm   #26
valveaudio
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Default Re: Refixing loose valve bases

I have used Loctite Body Filler (Halfords) with some success on KT66's, especially the ones that need a complete base replacement such as where the centre spigot on the base is broken off. I have never had one break.

I usually use a junior hacksaw and carefully cut the base in quarters and carefully loosen it from the glass, you can then unsolder the wires keeping them in the correct position for the new base.

Trevor
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