>Friends,
>
>What is the recommended method to pre-condition a
>"USED" pair of 3CX800A7's. These tubes have been out
>of service for a couple of years and I need to replace
>a pair of flat 3CX800A7's in my Lunar-Link, 2 mater,
>PA. Is is recommended to leave filament voltage on for
>several hours before applying HV? Is it recommended to
>leave HV turned on before applying drive power?
>
>I've looked through EIMAC's "Care and Feeding of Power
>Grid Tubes" but can not find any reference to
>pre-conditioning tubes for use.
>
Preconditioning vacuum tubes is a Ham myth unless except for tubes that
have a built in ion pump. However - a tantalum anode tube will getter a
small amount of gas when it is run at yellow heat.
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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