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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: How do you represent your tubes in PSUD2?

Set the current tap to the idle current draw of the circuit.

There is no way to test for power supply impedance in PSUD2.

You can do a stepped response (stepped load) with the current tap.

That will tell you 2 things,

1. if the supply filter will ring.

2. the DCR of the PS, but it will not tell you the impedance.

If the supply is feeding a Class A circuit then the average current draw over time (the longest time being the length of the lowest frequency in the music) will be equal to the idle current draw (assuming linear tubes).

If the final cap is large enough then the voltage should be largely sustained through the cycle even at the lowest frequency of interest.

Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 05/28/17

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