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Nope, I did not expect many to agree ;-) They are not new users ;-) But the point is a problem/suggestion was highlighted and quite correctly so. The solution must also be a solution that addresses

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

In message <j555at+95dr@...>, dated Sun, 18 Sep 2011, Tony Casey <tony@...> writes: Looking for an analoguespiceman award?(;-) The problem is not looking, it's guessing where to

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.. Putting a series resistor with the heater puts

AG, non of the valve (tube) models I've come across (and I've seen quite a few) model the effect of varying heater current or voltage - they simply (attempt) to model the relationship between the

WOW, You are sooooooo good to me :-), thanx .... best regards Leo ...

OK Helmut, many thanks

Confucius say: Things remain hidden mostly for want of looking. :-)

In message <j54t57+aisu@...>, dated Sun, 18 Sep 2011, Tony Casey <tony@...> writes: Thank you. Yet another hidden wonder! -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and

In message <4E75F5EB.8040605@...>, dated Sun, 18 Sep 2011, Ganesan <dg1@...> writes: The loss, and increased variability between samples, of performance is quite significant, and

In message <[email protected]>, dated Sun, 18 Sep 2011, Suusi M-B <smalcolmbrown@...> writes: They are a sort of FET, after all! (;-) -- OOO - Own Opinions Only. Try

Kudos Tony, Your response is extremely well written - clear and lucid, employing a keen understanding of the minutiae of LTspice to thoroughly answer Landrum's somewhat veiled request. Bravo for for

<snip> </snip> Hello John, I've uploaded to File>Temp a screenshot of what you need to change to banish your greys. Regards, Tony

Thanks.. i think some tubes used to carry plate current curves for different heater powers.. If going to 5.55 volts instead of 6.3 doubles the tube life, very few wouldn't do it.. cheers AG In the

I have mine this month too, but there's at least another 19days and 9.5 hrs left for me to do it. :-)

In the real world there is quite a difference between individual valves of the same type The model that I created was derived from the Phillips / mullard 1968 book graphs. There is no provision for

In message <j54n5o+ehah@...>, dated Sun, 18 Sep 2011, Tony Casey <tony@...> writes: YTM; I'm trying to do 3 months accounts for the VAT return! -- OOO - Own Opinions Only. Try

In message <j54mi7+uvcb@...>, dated Sun, 18 Sep 2011, Tony Casey <tony@...> writes: Yes, that's what I meant. Time to upload, clearly. See the zip archive Pos and neg doubler