On Jan 9, 5:54 pm, Dom wrote:
Thanks all for your good suggestions! This has given me some new
ideas to try.

Cheers Dom.

There was a recent thread on this group relating to making your own
triode vacuum tubes. The French video shows lots of glass work,
including the use of a VERY soft fluffy flame to preheat the freshly
cut glass before using a hot flame to smooth out the edge. You might
look back a few days and find the thread.

Reminded me of my old chemistry class in highschool and college. Doing
your own glass work was one of the first things we were taught in lab.

Paul