[R-390] . Re: Ballastubes (was inrush current limiters)

Tue, 24 Dec 2002 22:08:00 -0600 (CST)

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On Tue, 24 Dec 2002 21:41:18 -0500, Tom Bridgers wrote:

>So.... is it now agreed that using a diode in a half-wave circuit yields the
>necessary nominal 12 volts needed for the 6BA6 VFO and BFO  filaments in
>series?
>
>That seems to be the conclusion from Cecil's posting and his formula's:
>
>Diode half-wave circuit = ((25 volts input x 1.404 peak)/2)x.707 = 12.4
>volts
>with 25 volts input


No.  The correct formula is (25 x 1.414 ) x .5 = 17.675

- --
Jim Shorney      -->.<--Put complaints in this box
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