[old_tv_nut]

Originally Posted by Penthode

Glad you are working on the coffin again.

I am still curious about the tube and how all three filaments would simultaneously open. Perhaps a bad internal weld? My thought was perhaps a bad solder joint at the socket. Did you further investigate this?

I assume you must have ascertained the tube to be bad?

I remember your question about the filaments and will retest to see if I can find out what's what.