RE: Tube swap, take 2

Paul Tonizzo did this ... vector archived I'm sure ... almost 1 year ago.
Read this ... ask Paul for more info, I guess ...

  SPW

        -----Original Message-----
        From: Paul Tonizzo [SMTP:tonizzo@sybase.com]
        Sent: Wednesday, November 11, 1998 9:01 AM
        To: vectorlist@mcfeeley.cc.utexas.edu
        Subject: WG 6100 tube replacement - followup

        A couple weeks back I posted an inquiry about a suitable tube
        replacement for a 6100 (original tube# is 19VLUP22).
        I'm posting the results of my efforts (kinda long)...

        I got a reply from DangerWil@aol.com stating he had successfully
        used a tube from a WG K4600 by keeping the magnets from the K4600
        and using the yoke from the original 6100 tube. He also stated that
he
        got it to converge quite well.

        Given this information, I visited an operator friend and discovered
that
        there were no K4600's to be found. They are pretty old raster
monitors
        and the couple he did have were in machines and were badly burned.
:'(
        While there, I noted a couple Disco monitors on the shelf -
apparently, the
        chassis boards for these were really poor and thus they often died
long
        before the tube could get any burn-in on it. Sure enough, the tubes
were
        in excellent shape - if I hadn't known better, I would have guessed
they
        were new. The tube number for this tube is 19VKUP22.

        A quick post to the group about the tube got me a reply from Clay
stating
        that he had transferred this tube to a G-07 and had excellent
results. I
        figured I had nothing to lose and decided to try it in the 6100.

        The first thing I noticed was that the neck pinout had two extra
pins.
        Lots of
        digging revealed that an extra grid is supported by these two extra
pins
        and they can be ignored (in fact, an old technical journal I read
stated
        that
        early G-07's did not have the extra grid but that the tube could
still
        be used in them). Going on the assumption that I could ignore the
grid as
        well, I desoldered the neck socket from the Disco neck board and
        replaced the one on the 6100 's neck board with it. The socket fits
        perfectly
        and yes, the holes were there for the extra pins but they just go
nowhere.

        I then marked the magnet placement on the disco tube, removed them
        and removed the yoke. I put the 6100 yoke on and then carefully
replaced
        the Disco's magnets exactly where they originally were. After that,
all
        that was required was to reassemble the rest of the chassis and
setup
        convergence. The end result is what looks like a brand new 6100.
        On top of that, I got it to converge perfectly! :')

        There is a small thing to note though.
        The profile of this tube has a much more pronounced bow from the top
of
        the tube to the neck. As a result, the tube from screen to neck is
about 2
        inches
        longer. This has 2 results:

        1. The overall length of the monitor is longer then the original.
In my
        Space
        Duel cabinet, there is not quite enough room for the monitor IF I
use the
        original
        mounting holes in the cabinet. Luckily, there is plenty of rom to
move the
        monitor closer to the front of the cabinet and drill new holes. I
can't
        speak
        for other cabinets though.

        2. The more pronounced bow in the tube means that the HV cage just
touches
        the tube. To fix this, you can either use some washers to space the
HV
        unit
        back about 1/4 inch or you can just bend the top right corner of the
cage
        slightly
        so that there is some clearance.

        Soooo, if you're looking for a tube replacement for your WG6100,
here's
        what you can use:
        19VLUP22 (original tube)
        19VJTP22 (WG K4600 tube)
        19VKUP22 (Disco tube)

        For the K4600 and Disco tube, use the tube's magnets and the 6100's
yoke.
        I would also hazard a guess that G-07 tubes will also work fine
(given the
        Disco
        tube works in a G-07).

        I hope this helps someone else,

        Paul

> -----Original Message-----
> From: Fish, David [SMTP:dfish@bev.etn.com]
> Sent: Monday, November 22, 1999 2:03 PM
> To: 'vectorlist@lists.cc.utexas.edu'
> Subject: RE: Tube swap, take 2
>
> Mark J. wrote:
>
> >Once again, I attempted to graft a raster tube onto my Electrohome G08
> monitor.
> >The tube is a 19VJTP22 which came from a WG4600.
> ...<snip>...
> >So, I have abandoned this. I have heard some people have had luck doing
> this
> >with the WG6100 color xy monitors...maybe their yoke is shaped in such a
> way it
> >can move up closer to the tube...has anyone had any luck doing so? If
> so,
> I'll
> >just move the tube from my WG6100 over to the G08, and do the same
> experiment
> >with the WG6100.
>
> This begs the question, has ANYONE EVER sucessfully used a G08 or 19K610x
> yoke, which are designed for 100% tubes (19VLUP22's), on a 90% tube like
> the 19VJTP22, 19VLTP22, 19VMNP22 or M48AAW00X [med.res.] and got
> it to converge correctly? Was this something that Greg had done a few
> years ago? Mark, do you know for a fact that this has been done?
>
> And just where can you buy new convergence shunts? The ones off my old
> dead tubes have delaminated or are cut too short.
>
> David Fish "We want...Information. INFORMATION
> Melrose, MA USA You won't get it!
> fishd@tiac.net By hook or by crook we will"
> dfish@bev.etn.com _The Prisoner_
>
Received on Mon Nov 22 13:24:32 1999