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  1. Duncanampspsud
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Can PSUD2 model this PSU?

 

I have a basic PSU design for my tube amp that I am trying to simulate, however since I have multiple B+ rails I am struggling to add multiple (different) load resistors in the right spots so I can get my main B+ rail to work out but the secondary B+ rail is way off from my expectations probably due to the missing load resistor (I can only add one in this app). ?Any pointers? ?I am trying to measure Bpl and Bsl in my diagram below.
 

To be honest, you will struggle with this on PSUD.

It splits into four series/parallel filters which PSUD can't model and there's no future plans to add this functionality as it's way outside of the design brief. Personally, if I was doing this, I'd head straight to LTSpice which would do a great job of modelling this supply.

There's some advice on using LTSpice with valves/tubes here ->?

It shows a triode but the principle is the same if you want to make up a rectifier, just less pins. You'll find SPICE models for the 5U4 rectifier here ->?

Hope this is some help to you.

Regards,
Duncan
 

For quiescent conditions, you could simplify by combining the identical branches, (half the inductance and resistance, twice the capacitance, twice the current).? The resistor in the first section is added to the choke resistance since there is no R-L choice.?? Voltages should be spot-on; you can select component values accordingly if not.? Dynamic conditions will require SPICE.

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