[Amps] Tetrodes

[R@contesting.com]

On Jul 12, 2005, at 9:00 AM, Vic Rosenthal wrote:

> Ian White GM3SEK wrote:
>
>> In glass/metal tubes that operate
>> with a very hot anode, the getter is on the anode itself. In
>> ceramic/metal tubes that operate with a relatively cool anode, the
>> getter is usually on the cathode because that is the hottest place.
>
> Which seems to imply that when putting a tube in service that has been
> stored for some time, the way to activate the getter depends on the 
> tube
> type.  Filament voltage alone should work for a ceramic tube while a
> 3-500Z or similar should have enough plate current flowing to heat the
> anode.  Is this correct?

Good logic, Vic.  This is why actually operating a new 3-500Z is the 
only way possible to activate the getter.  Applying only 
filament-voltage for 24-hours to "condition" a 3-500Z is yet another 
laughable old wives' tale in Ham radio.

cheerz
>
> -- 
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
>
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Rich Measures, 805.386.3734, AG6K, www.somis.org