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Peter.N. · 26th Nov 2017, 9:28 am

I have occasionally seen white deposits on the inside of a valve and thought the same as you but if the heater lights up and it works OK I wouldn't worry about it.

Peter

26th Nov 2017, 9:28 am	#2
Peter.N. Dekatron Join Date: Jul 2008 Location: Charmouth, Dorset, UK. Posts: 3,601	Re: Unusual deposit in tube (valve) I have occasionally seen white deposits on the inside of a valve and thought the same as you but if the heater lights up and it works OK I wouldn't worry about it. Peter