Gerald,
Tried it a few times on 4-400A's. Sometimes it will clear, but always
comes back. Didn't seem to be worth the effort to me, but might have
been different if I had more than 5 bux invested in the tube.....
73, Larry
Larry - W7IUV
DN07dg
http://w7iuv.com
TexasRF@aol.com wrote:
> 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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