--- In LTspice@..., Ganesan <dg1@...> wrote:
My personal experience is de-rating the heaters to about 90% and
That's interesting - I've never come across anyone who's actually tried that until now - so maybe the old wise one's are not so wise, after all! I must say that I've been working with valves for only about 7 years now and I haven't had problems with any valves in my designs coming to their end of life yet - although they don't get used an awful lot, either.
I have a few items of vintage gear that are still running fine, although I haven't checked to see if the valves are still running to spec.
putting a mini fan.. can double or triple the life of these old valve
baseed equipment.. Putting a series resistor with the heater puts out
the same amount of heat in the system...
Yep, I've used mini-fans in a couple of my designs, too. They certainly keep things cool, which can only be good - not just for the valves.
But I will defer to your
expertise...
Definitely not an expert, just a fellow seeker of knowledge and enlightenment!
Martin
