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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

Thanks,, cheers AG

Most vacuum tubes will work with ac or dc on their filaments ( some will live a litle lesser under dc heating)... So the plate current is proportional to the heat generated in the filament until

Hello Landrum, You questions are somewhat ambiguous, since there is no such thing in this context as an RMS AC waveform. If you just want to look at the AC portion of the waveform in the viewer, you

They look cool/ Thanks.. Cheers AG..

They are included in LTSPICE, just hit the insert component menu and navigate to the "misc" folder... .

Are vacuum tube symbols available to use in schematic capture.? cheers AG