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Tractorfan · 13th Dec 2010, 10:17 pm

I imagine indirectly heated mains valves are much more robust as the heater is thicker, spiralled, insulated and tucked inside a cathode sleeve. Also, they're not under tension as directly heated filaments are so a breakage won't wreak as much havoc as a battery valve could.
Cheers, Pete

13th Dec 2010, 10:17 pm	#5
Tractorfan Dekatron Join Date: Mar 2008 Location: St. Frajou, l'Isle en Dodon, Haute Garonne, France.(Previously: Ellesmere Port, Cheshire, UK.) Posts: 3,184	Re: Daf96 I imagine indirectly heated mains valves are much more robust as the heater is thicker, spiralled, insulated and tucked inside a cathode sleeve. Also, they're not under tension as directly heated filaments are so a breakage won't wreak as much havoc as a battery valve could. Cheers, Pete __________________ "Hello?, Yes, I'm on the train, I might lose the signal soon as we're just going into a tunn..."