[Boatanchors] Ballast tube for Hallicrafters S-47 (Nytron 24B870) - data needed

[Bob Groh]

Thank you. That is a start on what I am looking for. Regarding the idea of
using a resistor, that certainly is a possibility but the behavior is of
the 24B870 is more like a 'constant' current device.  Piecing together the
information given so far, it would seem that the device would have 24V
across it at 300 mA.  As the voltage across the tube varies, the current
would stay more or less the same.  IF that makes sense. I'll keep
looking!!

Bob

On Sun, Aug 30, 2020 at 7:28 AM Rob Atkinson <ranchorobbo at gmail.com> wrote:

> The page on ballasts in the Tube Lore II book says 24B means it drops
> 23 or 24 v. at 300 ma.  The B means it has a pin for one lamp.   There
> was a 126 page Ballast Tube Handbook by A.P. Jacobi that Antique
> Electronic Supply sold with 1991 and 1994 editions.  I do not have a
> copy.  Maybe you can simulate the "tube" with a resistor.
> 73
> Rob
> K5UJ
>
> On Sun, Aug 30, 2020 at 12:39 AM <manualman at juno.com> wrote:
> >
> > According to the Riders drawing, it's a 330 ohm plug-in ballest.
> > Pete
>