>
>I have a pair of 4CX800A tubes that have been on
>the shelf here for a few years (and for an unknown
>period before I got them). I'm about to swap them
>into one of my Alpha 91b amps.
>
>Is there a recommendation to let these tubes run
>without HV for a period before pressing them into
>full service?
>
>I did a search of the archives, and it seems that
>there is no consensus on the need for this procedure
>for any but the largest "tubes with handles".
>
? Even for a gassy tetrode with handles, I have never found one that
would magikly get mo' betta by operating the filament. The bottom-line
seems to be: if there's gas, you'd better pass. However, if there's a
leaky ceramic-metal seal, Econco can resolder it during the rebuilding
process. It is my opinion that Ham radio is not free from old wives'
tales.
cheers,
> Jeff Maass K8ND
- R.L. Measures/Rich..., AG6K, 805.386.3734, www.somis.org
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