[Amps] Tetrodes

[Vic Rosenthal]

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?

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco