I was being lazy.Lurcher300b wrote: ↑Thu Jul 02, 2020 2:28 pmJust think about that for a moment. The current is not being supplied from the transformers, but from the caps, the transformer then tops the caps up 100 times a second. The variation in current draw from the load will govern how much the capacitor discharges in each 100th of a second.Thus, although the current may not be large a high capacity PSU is required to prevent throttling (basically what is going on in the Phono 3)
Not sure exactly what "throttling" means in this context (low load on the supply).
In the case of the power output stage then again the size of the cap and the output the load requires controls how much it is discharged. The size of the transformer controls how fast the cap is charges up, and if the transformer can't supply enough current in each 100th of a second to replace what the load draws in that time (and draws while its charging the cap), the the power supply will not get back to full voltage and will sag. But that should never happen with a load in the low ma range.
As you know the capacitors also smooth the output waveform and a larger capacity PSU may well just use larger capacitors. Clearly it makes a difference otherwise the Phono 3 wouldn't use a higher capacity power supply, well four different PSUs which is effectively a four times larger PSU.