Reference the 3-500 question and gettering. How can I get the tubes hot. I
guess I'm asking how can I adjust bias to do this. I have a TL 922a amp and an
AL 80a amp. Thanks
Arnie kd6cz
-------- Original message --------
From: Leigh Turner <invertech@frontierisp.net.au>
Date: 4/19/21 3:59 AM (GMT-08:00)
To: 'Aleksandar Petkovic' <vk6apk@bigpond.com>
Cc: amps@contesting.com
Subject: Re: [Amps] Gates RF103 3-1000
That's correct Alek.....the 3-1000Z must be treated the same as a 3-500Z,
i.e. the anode must be gotten cherry red in order to activate the residual
gas absorbing Zirconium getter coating on the anode surface.
The trick is to achieve the requisite dull red plate glow initially at the
lowest possible plate voltage...and then soak for a few hours to regenerate
the tubes as the plate voltage is then gradual incremented upwards and the
bias backed off to maintain the dull cherry-red plate up to the amplifier's
full rated plate voltage.
Then, and only then, will the tube be safely ready for action at full plate
HT and application of RF! Lest destructive internal plasma conduction
fireworks will ensue and the tube will be surely ruined... :-(
Leigh
VK5KLT / VK5LT
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Aleksandar
Petkovic
Sent: Monday, 19 April 2021 10:41 AM
To: amps@contesting.com
Subject: Re: [Amps] Gates RF103 3-1000
Is the 3-1000Z not like the 3-500Z in that the only way to get the
gettering to work is through having the anode nice and hot? That is
glowing nicely.
Therefore, it doesn't matter how long you let the tube run with filament
and fan, no gettering is happening. That is my understanding.
73, Alek, VK6APK.
On 19/04/2021 7:27 am, Robert W5AJ wrote:
>
> Firing up HV on 3-1000 this week
>
> QUESTION: Tube has been without RF / filaments for about six years
>
> How long should leave filaments on before attempting HV ???
>
> Filament, blower and cabinet fan are operating
>
> https://photos.app.goo.gl/e3x1TvkutJUnrHoE6
>
> Started down this road about year ago, side tracked..
>
> ALSO if anyone has RF103 and could supply photo of plate cap / connection
on
> top of the 3-1000!
>
> Robert
>
> Midland, Texas
> http://pages.suddenlink.net/w5aj/
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
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