Re: Bizarre Amplifone Problem

On Thu, 23 Oct 1997 22:35:20 -0500 (CDT), <jwelser@ccwf.cc.utexas.edu>
wrote:

>
>Hey all,
>
> OK, I finally got a chance to move my Quantum inside, next to my
>Star Wars. I hooked the outputs of both Amplifone boards in my Star Wars
>up to the Amplifone tube in the Quantum, and guess what? I got good
>vectors!
>
> So, that means that the problem is with the tube somewhere. Since
>it looks like I'm not getting proper deflection, I'd guess the yoke is bad
>(How does a yoke go bad?)

A short between windings either caused mechanically (rubbing / being
dropped) or chemically (oxidation of the varnish causes it to flake off,
or excessive heat causes it to turn brittle and flake off).

You can very closely inspect it and see if you can't find any bad spots,
all you'd have to do is find the short and separate the windings and it
would be fine.

A short in the winding usually has the appearance of very bad
trapezoiding (if that can be used a verb), but that's on a raster
monitor, I don't know how that would look on a vector monitor.

-Z

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Received on Fri Oct 24 13:09:45 1997