UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Boater Sam · 28th Nov 2017, 1:26 pm

Overheating of soda glass in the blowing/moulding process can be the cause. Normally re-annealing would remove the whiteness.

28th Nov 2017, 1:26 pm	#6
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: Unusual deposit in tube (valve) Overheating of soda glass in the blowing/moulding process can be the cause. Normally re-annealing would remove the whiteness.