[AMPS] Filament current

[n5ar]

I once worked with a tech who spent man;y years in the employ of Eimac.
Needless to say he had lots of tubes. This was in the days of the 250th
and 450th. He swore that tube filament voltage should be adjusted for
rated current rather than set to specified voltage.

73, Dan, N5AR

plantin@att.net wrote:

> Hi all,
> I just put filament voltage to my new 8169 tube for a
> little burn in time.
> To my surprise, the filament appears to drawing about 48
> or 49 amps instead of the data sheet 42 amps with 9.00
> volts at the socket.
> Should I be concerned? Could this be the norm for a new
> tube, then after a few hours, it will drop back to the
> 42 amps?
> Any informed insight would be greatly appreciated.
> --
> Regards,
> Bruce W3BP
>
>
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