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Thanks for the help so much.

So the question I am unsure of is what makes a good transient response compared to another, I sort of felt like the speed (tightness of the curve) to return to the steady state is desirable to be as rapid as possible; within the context of acceptable ripple and the lack of ringing / misshape of the profile curve or the output voltage. Is this correct and should I also look for ringing in other areas of the circuits?

This is the PS circuit I am trying to model, with approximately the design I am moving towards btw. The 6c45 takes voltage from halfway up the doubler of 2 x 5u4GB rectifiers, and I have struggled a bit to have confidence this is modelled correctly.

You're doing the right thing by using the step change to model the transient behaviour.

If ringing at the transition point is a problem, I've found it helpful to make the first C of a CLC section a significantly lower value than the second C. This has the advantage of presenting a greater damping from the load on what effectively has become a tuned circuit.

The nice thing is you can try some values and check out the effect without having to assemble the components.

Regards,
Duncan

So I am considering updating some old capacitors in an existing power supply B+ on a driver valve 6c45 and B+ on an output valve 211 in a single ended power amplifier. The existing design uses CLCLC for 6c45 valve and CLCLCLC for the 211.?

I am considering changing both of these for CLC to simplify the potential resonances/ringing in the Power supply, based upon some advice from another DIY builder, and to make them a little more responsive.

I have had a number of conversations on DIY AUDIO and the question I wanted to post here is I hope quite simple, as I have a question related to PSUD2 in particular.

Apart from Voltage and ripple of the stabilised supply for a steady state design objective, how can the transient response or any other additional design objective be modelled, or simulated.

So far I have used the profile of the initial start up curve and put in a step change in a constant current load, and tried to make the response as rapid and oscillation free as possible?

Any guidance gratefully received.