If I were to start with a clean sheet of paper I would use a CT full wave rectifier as my first choice, one tube, most of the time or two SS diodes. clean and simple. And buy the transformer that supply’s, the needed voltage. There are some good multiple tap transformers such as the Angela universal or the DIY lady day that can fill many applications.

If I have a given transformer and a full wave bridge, will get me the voltage I need, then that is what I will use.

As to what rectifier to pick, well this gets personal. Of course there is tube versus SS. Let’s keep it to tube for now.

First any tube we choose must be able to supply the current and voltage we need. Next, are we constrained to 5V or 6.3V heaters? Or not. That’s the easy part.

Next we can divide the remaining tubes, into directly heated, such as the 5U4 and 5y3.Or indirectly such as the 5v4 or 5ar4. One advantage of the indirectly heated rectifier is a slower ramp up of the B+. How much this matters is up for debate.

Next up Voltage drop. Depending on the tube 20V to more than 70V, more or less. This can be useful when you need a bit more or less voltage.

From here on it’s my tube is better then your tube. So let your ears and your wallet be you guide…John

Set something up, then change one thing at a time, try different tubes see what it dose to your voltage . Gee dose raising the second cap from 100uf to 220uf do much?

Take one transformer, say your 275-0-275 and run it thorough it’s possible permutations

full wave. Cap input.
Full wave Choke input

full wave bridge same as above.

Hey for extra credit try have wave.

A few pointers on using Psu2

referring to Damir’s post. You see that he runs for something like 2000ms after a delay of 0 sec.

I like to change the delay to say 30 sec sometimes to see what is going on after things settle down. Just beware that the graphs will look nasty , until you look at the Y axis and see how small it really is …John

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