> The SB-220 switch is from the same Centralab family used in
> the lower voltage Ameritron amps, Dentron amps, and many
> other places. Like any switch, it has a variety of breakdown
> voltages depending on what contact to what other contact and
> even how the soldering is done on the switch. Like any
> system with high voltages, the shape of conductor surface
> where it extends and everything around it is nearly as
> important as the spacing for determining breakdown voltage.
So true, Tom, as I have had my share of switch failures over the years due
to poor lead dress, improper soldering techniques, and poor layout. I
remember that on the Heath SB-1000 they had you install a flat washer over
one of the band switch solder lugs to beef up the voltage carrying
capabilities and act as a pseudo-corona ball.
Phil Clements, K5PC
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