[Amps] Fixing grid to cathode shorts

[Gudguyham at aol.com]

Recently in another venue Tom W8JI stated a 3-500 with low emission could  
be souped up by applying higher filament voltage for a period of time, 
however  he did not state what the higher voltage was or the time to keep it at 
that  voltage.  Does anyone know this?
 
 
In a message dated 9/9/2009 4:49:33 P.M. Pacific Daylight Time,  
aa6dx at arrl.net writes:

>  Message: 3
> Date: Wed, 9 Sep 2009 14:54:17 EDT
> From:  TexasRF at aol.com
> Subject: Re: [Amps] LK500-ZB
> To:  royanjoy at ncn.net, amps at contesting.com
> Message-ID:  <d57.333a4d82.37d953d9 at aol.com>
> Content-Type: text/plain;  charset="US-ASCII"
>
> 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
>
>
Yes ... used to do that with 4-1000s back when ...  could get as-new pulls 
from local TV station in the 60s - 70s  !!  According to them, "dead" --  
actually had re resuscitated  some  of them multiple times ... The usual 
pulls from the station were really  lame, as they moved them from video to 
audio finals, and were plumb worn  out ... the "dead" ones were much newer, 
when "fixed" --- lots more  gain!
Mark, AA6DX  

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