[Amps] Gettering 572B

John Lyles jtml at losalamos.com
Sun Jun 21 21:53:52 PDT 2009

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 <larry.k4ab at gmail.com>
> Subject: [Amps] Gettering 572B
> To: amps at contesting.com
> Message-ID:
> 	<5b335b050906201856u3ac6f2a9n9e81a5e05214757c at mail.gmail.com>
> 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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