Re: It's alive 25" vector

There are a couple of Phillips 25" tube/yoke pairings that have some
possibilities. IF the horizontal windings are switched from parallel to series
and IF the vertical windings are switched from series to parallel, BOTH
windings are very close to the same inductance (about 1.3 mH) and have about
the same sensitivity (about 4.5 amps to move the spot to the edge of the
screen). At this inductance I figure about 8 volts applied will get the spot
from one side to the other in a millisecond. With 24 volts drive you would
think about a third of a millisecond could happen. But this may still be too
slow. These tubes also come right out of the box converged with no further
adjustment possible. Might play with one some day, if they aren't too pricey.

Probably the way to REALLY use one of these is to find out what TV uses them
and then buy the TV. That way the other stuff you need (HV system, neck board,
video drivers, etc.). come along with it at probably not much more than the
tube would cost alone in low quantity.

Aaron Howald wrote:

> ----- Original Message -----
> From: "Jeff Anderson" <mayday19@idt.net>
> To: <vectorlist@synthcom.com>
> Sent: Monday, May 01, 2000 7:36 PM
> Subject: Re: VECTOR: It's alive 25" vector
>
> > Unfortunately most of the new sets do not use convergence rings any
> > longer. They now use ferrite rings and the convergence is
> "programmed"
> > into the ring at the time of manufacture. It cant be changed and I
> doubt
> > you can remove the ring without breaking the neck..
>
> Worth noting... RCA and GE sets have the yoke bonded to the tube, it
> cannot be removed!
> The programmed rings can be cut off though...
>
> >Better TVs now have
> > dynamic convergence. Instead of ferrite or convergence rings there
> is
> > another small yoke for convergence.
>
> Larger tubes use this, along with dynamic foucus
>
> >Either way you cant win using newer
> > tubes. Its just junk..
>
> A shame-newer tubes have better contrast and foucus-usually!
>
> >I guess you could try to use some older rings on a
> > CRT that had dynamic convergence, since you can remove both yokes
> easily.
> > Besides any TV that uses DC should have a damn good (and large) CRT
> > (probably be 2-3 years before those show up junked though).
> >
> > There ARE and will for a while be a surplus of CRT projectors out
> there.
> > Most of the projectors are getting near the end of their useful life
> are
> > are being replaced with easier to maintain LCD or DLP projectors..
> I'm
> > planning on trying to build a vector projector sometime using an old
> > BARCO analog chassis CRT projector.. Its going to be a hacked up
> mess
> > using 3 amplifone deflection boards, but it will have a 150" screen
> :)
>
> Oh please post pics when done!
>
> I want to use a super hi-res computer monitor tube but they are still
> too expensive in a large size...
>
> Aaron Howald
> ahowald@w-link.net
>
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