07-23-2022, 01:14 PM
My thought would be that the tube has become gassy, air leaked into the tube.
See:
https://philcoradio.com/phorum/showthrea...1#pid87101 and
https://www.russoldradios.com/blog/previous/10 and
https://philcoradio.com/phorum/showthrea...ight=gassy
See:
https://philcoradio.com/phorum/showthrea...1#pid87101 and
https://www.russoldradios.com/blog/previous/10 and
https://philcoradio.com/phorum/showthrea...ight=gassy