[R-390] BallasTubes (was inrush current limiters)

Fri, 27 Dec 2002 14:49:38 -0800

Does not!  It glows all the time.  If yours does not,
then it is not a 3TF7.  The iron wire is strung
up and down in vertical segments arrayed around
the periphery of the imaginary cylinder formed
by two mica washers.  Some segments will glow,
others not.  How many, depends on the voltage.
As it rises, more will glow.  If it's all dark,
it's out of regulation on the low side.  If it's
all lit, it's out of regulation on the high side.

73,
Dave Wise

> -----Original Message-----
> From: Jon & Valerie Oldenburg
> [mailto:[email protected]]
> Sent: Tuesday, December 24, 2002 4:59 PM
> To: Barry Hauser; Drew Papanek; [email protected]
> Subject: Re: [R-390] BallasTubes (was inrush current limiters)
>=20
>=20
> The 3TF7 only glows for a second as it warms up ( and barely=20
> perceptible at
> that) Orange diodes are overkill.  ( Sorry' I couldn't=20
> resist. This thread
> has always been an interesting one though!)                   Merry
> Christmas Jon AB9AH
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> > Drew wrote ..
> >
> > <snipped>
> > > ... How about including an
> > > orange LED in the 3DW7 to simulate that warm filament glow :-)
> >
> > How about an orange Xmas tree bulb altogether
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