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Skywave · 24th Apr 2020, 1:47 pm

Some B7G and B9A valves are designed to run hot, sometimes very hot. Fitting screening cans painted matt black to those valves increases the radiation of heat from those valves - and that, in turn, increases the valve's life.

Al.

24th Apr 2020, 1:47 pm	#2
Skywave Rest in Peace Join Date: Jun 2006 Location: Chard, South Somerset, UK. Posts: 7,457	Re: When to fit valve screening cans? Some B7G and B9A valves are designed to run hot, sometimes very hot. Fitting screening cans painted matt black to those valves increases the radiation of heat from those valves - and that, in turn, increases the valve's life. Al.