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@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
>>
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