Re: G05-802 focus issue

Where is nearby?

On Sat, Jul 24, 2010 at 2:03 PM, Darren Finck <dgfinck@yahoo.com> wrote:

> My scope's max input is 300V, so I adjusted the focus to about that (which
> is coincidentally pretty much the optimal focus). Hooked it up, and there I
> see almost no AC component--on the order of millivolts. I was actually
> surprised how close to pure DC it is, as it's only half-wave rectified, and
> has a smallish filter cap. I guess the high frequency and essentially zero
> current draw make this so? In any case, the focus voltage looks steady and
> solid.
>
> I loosened the yoke and play around with it some. It is pretty much as far
> forward as it will go. With the exception of a blob of what appears to be
> factor-installed hot glue between the yoke and tube, it's pushed fully
> forward. I suppose I could remove the glue blob, but I'm a little reluctant
> to do so. Also, sliding the yoke back ~1/2" or so and then forward again, I
> don't really see any change in focus quality, so it doesn't appear very
> strongly dependant on forward/aft location.
>
> Regarding the vectors; there about as straight as I've seen for Atari
> vectors. They're not perfect, like you see with MAME, but I wouldn't
> consider them squiggly. As an aside, when I changed out the "bottlecap"
> (TO-3) transistors on the frame with new ones, I *did* have squiggly
> vectors. But I put back in the old components and the vectors are good
> again. I didn't play around with permutations to see if it was just one of
> them, or the whole lot, causing the issue. Odd, but in summary no, vectors
> are not presently squiggly.
>
> No, it doesn't improve after 15-20 minutes. It's a bit worse when I can
> first see the image after turning it on cold (~15secs), but after ~60 to 90
> secs, it's pretty much as focused as it's going to get, and it remains the
> same even after being on for hours.
>
> Regarding the rejuvinator. I don't have one, nor do I know anyone nearby
> with one. It would probably be a last resort.
>
> Thanks guys,
>
> Darren
>
> --- On *Fri, 7/23/10, Rodger Boots <rlboots2@gmail.com>* wrote:
>
>
> From: Rodger Boots <rlboots2@gmail.com>
> Subject: Re: VECTOR: G05-802 focus issue
> To: vectorlist@vectorlist.org
> Date: Friday, July 23, 2010, 4:33 PM
>
>
> Make sure yoke is all the way forward.
>
> If you have a scope (and it can handle the voltage) look at the focus
> voltage and make sure it doesn't have ripple on it.
>
> look at the vectors and see if they are straight lines or squiggly.
>
> On Jul 23, 2010 3:25 PM, "Mark Shostak" <shostakmark_at_gmail.com<http://mc/compose?to=shostakmark@gmail.com>>
> wrote:
>
> Does it get any better after 15 - 20 minutes of operation?
>
> -Mark
>
>
>
> On Fri, Jul 23, 2010 at 3:21 PM, Darren Finck <dgfinck_at_yahoo.com<http://mc/compose?to=dgfinck@yahoo.com>>
> wrote:
> >
> > I like the way you th...
>
>
>

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Received on Sat Jul 24 15:38:50 2010