Has anyone tried to blow a grid to cathode short with a high current pulse
of energy? Such as touching the shorted pins for an instant with a car
battery. At this point seems not much to loose by trying.
73,
Gerald K5GW
In a message dated 9/9/2009 1:46:57 P.M. Central Daylight Time,
royanjoy@ncn.net writes:
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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