> Considering the preceding email; Would it make sense to directly ground
> SB-220 grids and fuse the filament/bias transformer such that a ground
> fault would interrupt filament, bias, and HV? I would probably leave the
> fan on a separate circuit. . . Art k3xf
That's one solution Art, if it accompanied by HV current limiting in
the form of a HV rated current limiting resistor in the HV lead.
Remember the HV fault inside a tube is normally from anode to
grid.
HV is an almost impossible thing to fuse reliably, so the best
option is generally to protect things with clamping diodes and add
enough surge resistance to prevent major fault damage.
73, Tom W8JI
w8ji@contesting.com
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