[Amps] Switching Power Supplies

[Tom W8JI]

> I'm aiming for a floating supply as the current project is 
> a tetrode
> running with the screen at ground potential. I initially 
> thought about a
> dc supply where the switching frequency can be filtered to 
> a minimal
> level, but then I thought about using the ac (more or less 
> square wave)
> instead for simplicity. Capacitive coupling from the 
> heater to the
> cathode is quite high impedance, and the cathode is 
> bypassed to ground
> so I figure that the likelyhood of heater voltage getting 
> transferred
> onto cathode-control grid bias voltage is low.

How will a switching supply handle a HV to ground fault if 
the tube arcs?

73 Tom