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Answer to both questions

I'll try to make this a little more clear. Here's a prop for the info presented.

The circuit is a loop. When the cap is getting charged all 4 elements: transformer secondary, vacuum diode, filter cap, and SS diode are in series. Current is charging up the filter cap. When the voltage on the secondary reverses both diodes disconnect.

The real excitement happens at the moment that the secondary just starts reversing. With SS diodes there will be a short moment when both diodes are conducting backwards. When the SS diodes finally do disconnect we get the reverse recovery spike as the magnetic field setup by the reverse current field collapses.

With the vacuum diode in the curcuit things change. The vacuum diode does not have reverse recovery current. By the fact that all 4 elements are in series the current through each element is identical, (first approximation here!).

I suspect that there might still be a small amount of noise generated by the SS diode working against the secondary inductance and capacitance, but it should be quite small compared to what the reverse recovery spike can be.

If anyone else has info to add please do!

Gary


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