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Old 7th Feb 2023, 3:28 pm   #14
G.Castle
Heptode
 
Join Date: Dec 2020
Location: Swaffham, Norfolk, UK.
Posts: 582
Default Re: Top cap shortage?

Quote:
Originally Posted by Silicon View Post
I would have assumed that pure copper would be a poor choice for Top Caps.

It is not very 'springy' and after many heating and cooling cycles would tend to work loose.

A steel spring outside a copper or brass sheet contact would probable be OK.

A short piece of high temperature silicon tubing to hold the contact in place, might be OK on the cooler receiving valves
You would think so, as I did, but the idea seems perfectly fine if the coil is wound on a form a little smaller than needed for the cap so it grips. I have made the connectors from beryllium copper sheet/spring copper, though they don't seem to have any advantage, I have also seen the idea used with PL509's for PA stages in home brew transmitters, also without issue.

Regards, Greg.
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