CJ3 Tube loose top terminal Epoxy for bedding?

samo · Mar 3, 2017

A known good CJ3 tube for a 10EE has a loose top terminal. Had it in storage for years and drug it out to
use it and noticed the top bedding or epoxy has crumbled away and the lead came unsoldered.
Curious if someone knows what to bed the top terminal cap with that can take the heat from a modular drive.
This is my last known good tube and would like to save it. Sam

Monarchist · Mar 3, 2017

samo said:
A known good CJ3 tube for a 10EE has a loose top terminal. Had it in storage for years and drug it out to
use it and noticed the top bedding or epoxy has crumbled away and the lead came unsoldered.
Curious if someone knows what to bed the top terminal cap with that can take the heat from a modular drive.
This is my last known good tube and would like to save it. Sam

The parts move. Most epoxy will melt or soften and lose grip.
Superglue is reputed to cause cracking of the glass tube envelope.

High-temp Red RTV has been suggested. Also the adhesive appliance repair shops carry for clothers-dryer gasket attachment.

RCA's pre-WWII tube 'base' adhesive formula is in here:

http://el34world.com/Forum/index.php?topic=10846.0

Any auto-supply may have small qty's of exhaust system sealant similar to:

http://www.cotronics.com/vo/cotr/rm_adhesive.htm?gclid=CL36leu4u9ICFQhLDQodFCMJog

samo · Mar 3, 2017

Thank you, the exhaust sealant or high temp RTV sound the most practical. The RTV is rated for 650 Deg. F and
the Exhaust sealant is rated 2000 deg. F (from permatex website)

Sam

PaulM · Mar 7, 2017

Also c3j tubes are "relatively" inexpensive so probably not a crisis if you need to get a new one.

CarlBoyd · Mar 7, 2017

samo said:
A known good CJ3 tube for a 10EE has a loose top terminal. Had it in storage for years and drug it out to
use it and noticed the top bedding or epoxy has crumbled away and the lead came unsoldered.
Curious if someone knows what to bed the top terminal cap with that can take the heat from a modular drive.
This is my last known good tube and would like to save it. Sam

Maybe furnace cement.

CarlBoyd

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CJ3 Tube loose top terminal Epoxy for bedding?

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