[GreenKeys] CRT Left side char distortion...

[Chris Elmquist]

I had similar thoughts as Ken but also the possibility that the CRT
may need a degaussing.  Not sure when degaussing coils became integral
and automatic but it's possible that while this tube "held down the
closet", it got magnetized externally in a non-uniform way and this is
now distorting the image.

I have seen this when a video monitor was stored next to the large steel
chassis of another piece of equipment and this warped the image after
that CRT was pulled out and powered up.

If the gear has an integral degaussing coil and does it automatically
at power up (the image will wiggle right after power up if so) then you
can probably discount this idea.

https://en.wikipedia.org/wiki/Degaussing

Chris NØJCF

On Tuesday (09/15/2015 at 02:51PM -0400), Kenneth Gartland wrote:
> Hi all...
> 
> Keith's problem of char distortion, is likely linear sweep as mentioned
> already, but maybe as simple as a 'Deflecting magnet" having dropped
> (Unglued) from the CRT area just ahead of the yoke ass'y...
> 
> Many of the older, especailly cheaper, CRT's used as computer monitors,
> used these stick on magnets to cure all kinds of deflection issues, especially
> in the corner areas of the tube...
> 
> Some magnets were held on by a silicone seal adhesive, or equiv., and some
> were fastened with an adhesive pad...
> 
> Best for Keith to check in the base of the CRT area to see if this is
> the case...
> They usually fall off and go straight down, where you can't. get at
> them of course!!
> 
> Almost forgot!...If the CRT has 'Centering' tabs on the CRT neck, moving the
> tab up or down on the left side mite clr the problem...Use an orange stick or
> some other insulated tool to carefully move the tab...Lotsa HV in
> there so one has
> to be carefull!
> 
> Hope this helps a bit...
> 
> Cheers!
> 
> Ken VE3-HMQ
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-- 
Chris Elmquist