About:
"...No visible damage to the case, but now when the amp is turned on, but in
standby, the plate current reads about 200mA and the grid current is pegged
negative. Plate voltage is lower than what it used to be, about 2600 V.
Switching between RX/TX doesn't seem to have any affect, I can hear the
relay kick. One final observation, in RX, one tube starts to glow orange,
while the other stays the normal light yellow color...(etc.)"
My ZB had that happen several times when using Eimac tubes AND before I
installed a good in-rush protection circuit plus ridded it of parasitics.
Never has occured since (with RFP tubes). It's surely a grid - to - fil
internal short.
73, Roy K6XK
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