Re: G05-802 focus issue

Another obvious suggestion: Try a different CRT. I had a problem with
a center spot which only went away once I switched CRTs.

Darren Finck 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@gmail.com
>> </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@yahoo.com
>> </mc/compose?to=dgfinck@yahoo.com>> wrote:
>> >
>> > I like the way you th...
>>
>
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Received on Sat Jul 24 15:26:38 2010