Hi,
Is there some way to build a tube amp in a metal case, using the case as RF
ground, and not have current flow out of the amp through the grounding
conductor? (other than isolating that ground from the case entirely, which
presents it's own problems - for example capacitive coupling to the case).
I'm currently experimenting with an amp and I have to power it via an
isolation transformer (the high voltage is 3 phase on its own circuit with
no GFCI temporarily) or my RCD will trigger.
The high voltage power supply is an old military device that used its
chassis as ultimate DC ground (hv ground connects to it through a
overcurrent protection coil).
Then I also used the chassis as ground for DC HV, screen and grid supplies.
This I could swap, but it's the RF ground (especially the Pi tank) I'm
concerned about.
Is essentially isolating amp RF ground from the grounding conductor
(PEN/EGC or whatever it's called where you are) the only way?
73,
Łukasz, SP4IT
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