[ARC5] OK Smart People - Mystery 211s

[Geoff]

Where is the getter in a 211 and if its on the anode when did that happen? I 
dont believe early production used that process??


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "Neil" <neilb at ihug.co.nz>
Cc: <Arc5 at mailman.qth.net>
Sent: Friday, June 15, 2012 6:17 PM
Subject: Re: [ARC5] OK Smart People - Mystery 211s


> On 16 Jun 2012 at 9:42, Neil wrote:
>
>> > Connect the grid to the plate, and apply normal filament voltage to the 
>> > tube.
>> > Insert a millimeter in the plate voltage lead, and apply something like 
>> > 45 volts
>> > to the anode, or whatever voltage is necessary to achieve about 250 mA 
>> > of
>> > plate current. Watch the meter. At some point in time, plate current 
>> > will start
>> > to rise, and may rise very rapidly. At this point, shut off the anode 
>> > voltage.
>> > The tube should be ready to use.
>>
>> Surely this will lead to severe grid damage?
>
> Might: depending on the tube.
>
> Ken W7EKB
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