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[Amps] Gettering 572B

Subject: [Amps] Gettering 572B
From: John Lyles <>
Date: Sun, 21 Jun 2009 22:53:52 -0600
List-post: <">>
What exactly do you mean by the term 'gettering'. I know what a getter is,
inside a tube, but I have never heard of being able to getter a tube, 
i.e., as a verb. If HV was on when you were in standby, depending on 
your cutoff bias, or idling bias, would control the amount of Ip. Could 
you explain what the condition was, cutoff bias or some amount of 
conduction (like zero signal anode current?). I guess this depends on 
how your radio defines 'standby'.


> Message: 4
> Date: Sat, 20 Jun 2009 20:56:03 -0500
> From: Larry K4AB <>
> Subject: [Amps] Gettering 572B
> To:
> Message-ID:
>       <>
> Content-Type: text/plain; charset=ISO-8859-1
> I noticed when gettering a new set of 572B's that I was drawing about 200mA
> Ip during standby.
> I quicky turned off the juice.
> Questions:
> 1) Should I continue the gettering with the plate caps removed?
> 2) Is gettering even necessary with high quality tubes?
> 3) Are,(at least one of tubes) bad?
> 73,
> Larry K4AB

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