As I was designing the power supply for my tube amp, I was trying to reduce the negative transients of the choke input supply, I tried to add a capacitor in front of it (C1 in the schematic).
It reduced the transients, but also reduced the peak current of the rectifier. I tried experimenting with different values (in the Duncan's PSU designer) and it looks like 1uF is better than other common values.
Rectifier current with the cap 1nF (effectively no cap):
Rectifier current with 1uF:
Rectifier current with 2uF:
I guess the capacitor is compensating for the choke current (power factor?). Anyone knows the proper theory why does this happen? Also, does anyone know a formula that can be used to calculate the optimal capacitance?
I tried this with Multisim too and saw similar results.