Argus wrote:
Thanks a bunch for your input guys.

Tube caps and bases used to be cemented with high temperature frit-type
cements. Sauereisen cement or a mixture of litharge and glycerine used
to be popular. The same sort of things that are used to cement bases onto
light bulbs today.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."