Posted by PakProtector [ 205.188.116.67 ] on December 01, 2005 at 19:29:03:

In Reply to: Re: Some questions on Power supplies posted by 2wo on November 28, 2005 at 22:03:53:

I have played with many variations of tube PS with that Sim program. I don't thing that the tube warm up was properly modeled. I have examined two slow heating tube diode PS. Both were L-C and both showed considerable overshoot with PSUDii. No such overshoot was observed in the real world with tubes warming up fairly slowly.

I did try a hot switching ON-OFF-ON and found it did behave as PSUD predicted, leading me to the conclusion that they have a single parameter set for the tube diodes( or pairs of diodes ) which does not truthfully show the warm-up behaviour.

When I used Hg-vapour diodes, such as a pair of 816's I was able to see the current waveform in the brightness of the pretty blue glow. Even caught the oscillations as predicted by PSUDii.
cheers,
Douglas
cheers,
Douglas

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