The B- rail, especially if dealing with a separate
power supply, is just as hazardous as the B+ rail!
Ordinarily the amplifier of good design will have
bleeder resistors from B+ to Frame, a series of
diodes from B- to Frame, a metering shunt from
B- to Frame, and maybe a direct connection at
the tube socket(s), from that to Frame, if so designed.
All these pieces may fail.
There might be a catastrophic component failure
and a resultant spike, going somewhere......
The B- or HV Return line should be treated as
cautiously as the B+, with spark plug wire, with
decent connectors that would resist arcing of the full B+,
with intelligent lead dress, with solder point anticorona dope, the
whole nine yards.
While maybe not a performance issue, B- dressage is
a Safety Issue. Why skimp?
Hal
W4HBM
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