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@arrl.net writes:
> Message: 3
> Date: Wed, 9 Sep 2009 14:54:17 EDT
> From: TexasRF@aol.com
> Subject: Re: [Amps] LK500-ZB
> To: royanjoy@ncn.net, amps@contesting.com
> Message-ID: <d57.333a4d82.37d953d9@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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