[Amps] Tetrodes

[GGLL]

	Please, let me jump in here, with my usual question: for my two, nos RCA 8122
(they have been stored many years) that I plan to put in use in a friend's NCL
2000 linear, will suffice to turn on heaters only, during say, 24 Hs?, or I
need also to make them work at low plate voltage after that 24 Hs. preheating?

TIA
Guillermo - LU8EYW.

R at contesting.com;Measures escribió:
> 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
>>