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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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SET Asylum Single Ended Triodes (SETs), the ultimate tube lovers dream. |
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In Reply to: what spice sez posted by dave slagle on January 9, 2015 at 10:38:19:
Dave, since you are doing those simulations in SPICE, I wonder if it is fairly straightforward to include the transformer and rectifier in the sim also? One could then look at the behaviour when the power supply is loaded with a constant quiescent current and a superimposed sinewave current (so I = I0 + I1 Sin(w t), simulating a typical load of an SE amplifier reproducing an audio frequency f=w/(2 \pi)). It would be interesting to see how the magnitude of the audio "ripple" on the power supply output voltage behaved for various frequencies f in the vicinity of the resonance in the low audio spectrum in the drlowmu supply.The reason I am wondering about this is that the approximation of putting that 100 ohm resistor to "represent" the power transformer and rectifier is a bit of a rough and ready one. The behaviour of the impedance curves changes significantly if one alters that 100 ohm value. I think the qualitative feature of the resonance is always going to be there, however.
I'm not familiar with using SPICE, and although I can handle LCR networks fairly easily (when I'm not making stupid typos!) using Mathematica, it's a rather tougher proposition to try to deal with rectifiers without the aid of a dedicated program like SPICE.
So it might be interesting to see what SPICE would reveal, along the lines I was suggesting. Oscillatory loads are much more relevant than stepped loads for probing the relevant features of a power supply for an SE amplifier.
Chris
Edits: 01/09/15
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- RE: what spice sez - cpotl 15:47:00 01/09/15 (0)
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