In message <4E762028.8050305@...>, dated Sun, 18 Sep 2011, Ganesan <dg1@...> writes:
My personal experience is de-rating the heaters to about 90% and putting a mini fan.. can double or triple the life of these old valve baseed equipment..
I agree with the fan, but I don't see how you can show double or triple life, unless you are basing it on 1970s poor-quality products (mainly bad vacuum and bad welding). Well-made valve/tubes typically last 10 years, so to show triple life you would have to run tests for 50 years.
I have some 50 year old test equipment that still works within spec with the valves that were in there when I bought the gear in 1984.
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