Tube life is related more to the temperature of their envelope, if the heater is reliably constructed.
I'm not sure that you can assume a more reliable tube technology, post 1960. A fifty year old piece of equipment has not demonstrated a 50 year component life.......
RL
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--- In LTspice@..., John Woodgate <jmw@...> wrote:
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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John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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