Re: [Amps] Thoriated tungsten lifetime when idling tspa

["Phil Clements" <philc@texascellnet.com>]

> 1.) You don't turn the thing off and on needlessly.
>  2.) You do a filament circuit that limits extended warm-up
> current to twice the rated current or less.

The way Henry deals with #2 above is inserting a 10 ohm 50 watt power
resistor in series with one side of the 240 volt primary of the filament
transformer. This is on their 3X3 amps. There are 6 taps on the primary of
the transformer to set the proper voltage at the tube pins.

(((73)))
Phil, K5PC



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