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Old 4th January 2011, 01:07 AM   #1
roline is offline roline  United States
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Default loose plate caps, hi temp glue???

I have several loose plate caps needing a hi temp glue, I dont want to buy a quart of the stuff which starts to limit me from the good stuff. Any suggestions where smaller quantities can be had?
SO many tubes, SO little time!!!
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Old 4th January 2011, 03:50 AM   #2
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Suggest you try a two-part epoxy resin, I have had reasonable success regluing 807 top caps with it, dunno what the brand name would be in your part of the world, downunder the common one is Araldite - a pair of syringes joined at the hip containing resin and hardner, in a blister pack.
High temp RTV sealant might work too, some them are quite sticky.
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Old 4th January 2011, 04:16 AM   #3
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Originally Posted by roline View Post
I have several loose plate caps needing a hi temp glue
I used my multimeter and a thermocouple to measure the temperature on the top of a power tube and it is surprisingly low - around 105-110 degrees Celcius (just over the boiling point of water). Most epoxies will withstand this type of temperature virtually indefinitely (interesting point - some electrolytic capacitors are rated to operate for 2,000 to 3,000 hours at 105 degrees celcius).
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Old 4th January 2011, 05:00 AM   #4
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I would go for high temp RTV over epoxy. Epoxy gets soft and smells really bad when it gets hot.
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Old 4th January 2011, 05:33 AM   #5
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I've had great luck using JB Weld metal filled epoxy. JB Weld is good for 500 degrees F. I've used it to fix several 1624 top caps that were loose. Unsolder the loose cap so you can get the epoxy properly placed. After the epoxy is cured you can re solder the top cap.
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Old 4th January 2011, 06:39 AM   #6
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I can recommend Selleys 401 - a clear silicon RTV in a standard cartridge - much more cost efficient than a small tube of auto RTV (and clear looks nicer than black) - 205C continuous with 260C withstand - also good for adding/making microphonic dampers as well.

Ciao, Tim
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Old 4th January 2011, 06:47 AM   #7
ktuuri is offline ktuuri  Canada
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I have used two-part epoxy resin from a dollar store with very good results.
I have done it a number of times with no problems at all.
Have done a number top caps on Mercury Vapour Rectifiers and they run very hot!
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Old 4th January 2011, 03:33 PM   #8
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I'll second the JB weld. I have glued top caps and tube bases with it. I also plugged a hole in a cast aluminum oil pan on my Volvo. The repair was still good when I sold the car 4 years later.

Get it at an auto parts store, or Walmart. You want JB weld not JB quick.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 4th January 2011, 05:20 PM   #9
Kmet is offline Kmet  Croatia
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Default liquid glass

Try mixture of liquid glas (Na2SiO3) with some finegrained sand (or dust). I prefer to use quartz type of fine sand but all sorts of fine sand will work. After some experimenting I manage to glue several anode caps on 6146b tubes.
One more thing..clean all electrical contact surfaces before 'glue' makes firm bond.
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Old 4th January 2011, 08:14 PM   #10
Doz is offline Doz  United Kingdom
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I use fireclay exhaust paste
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