Re: 25" LOW res CRT on Star Wars

I do have a spare yoke around, but the owner (CKONG) took the monitor with him. I might try it when he will put the game in his still to build gameroom next november or so...

I dd loosen the yoke completely. What also baffled me was that when setting the blue raster there was not a single position where I could get an overall blue raster. Some corners (mostly on the left top and bottom) were either completely dark or went to green but I couldn't get it right.

I did numerous degaussings to make sure that wasn't the cause.

Could it be that the deflection currents in the yoke were simply not high enough by some cause on the deflection board ? Stupid, but I forgot to try my own deflection board.....

I do realize that resolution has nothing to do with it, but could f.i. the gun placement be different from a mid-res tube ? I doubt it but maybe ?

Thanks, Andre

Op 17 jul 2010, om 17:14 heeft andre het volgende geschreven:

> I have had this on proper 19" amp crt's with the proper yoke. I also had this on a raster lately.. G07 I believe. Can't offer you much advice other than to take it all off, and start over.. I seem to almost always get a different result swapping rings, or at least re-doing the yoke from purity on..and many times for the slightly better. If you have a second yoke, maybe try that. Take some impedence readings to see if they vary because I would really like to know the cause as well.. its pretty irritating/exasperating.
> Doubt your tubes are different angles.. and I also have a Gravitar that came with a factory amplifone setup, but had a standard res crt in it. Resolution doesn't make a dif.
>
> --- On Sat, 7/17/10, Andre Huijts <a.huijts@upcmail.nl> wrote:
>
>> From: Andre Huijts <a.huijts@upcmail.nl>
>> Subject: VECTOR: 25" LOW res CRT on Star Wars
>> To: vectorlist@vectorlist.org
>> Received: Saturday, July 17, 2010, 9:36 AM
>> This is now the 2nd machine I'm
>> working on that has a LOW res tube instead of a med-res that
>> is supposed to be in there.
>>
>> The FIRST machine I worked on has a WG6100 chassis.
>>
>> The SECOND has an Amplifone chassis, but as mentioned BOTH
>> have low res CRTs.
>>
>> Now, whatever I try, I cannot get these things to converge
>> at least a BIT nicely.
>>
>> Using the test-raster screen ,the main issue is that blue
>> is UNDER the horizontal white lines on the top, but is ABOVE
>> the horizontal white lines on the bottom. Whatever I
>> try, I cannot solve this because if I make it correct on the
>> top part of the screen, it will become worse on the bottom
>> part and vice versa.
>>
>> Now, my theory is that the yoke is probably not set-up for
>> a 25" low-res tube that may have a different angle than the
>> mid-res tube. Could that be the cause ?
>>
>> Or could it be that we are using a wrong or to weak
>> convergence ring-set ?
>>
>> Regretfully the typenr. of the used CRT is torn-off so I
>> can't see if it's 90 or 100 degrees.
>>
>> André
>>
>>
>>
>>
>>
>>
>> ---------------------------------------------------------------------------
>> ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
>> ** Please direct other questions, comments, or problems to
>> chris@westnet.com
>>
>
>
>
> ---------------------------------------------------------------------------
> ** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
> ** Please direct other questions, comments, or problems to chris@westnet.com

André Huijts
andre.huijts@upcmail.nl

---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Sat Jul 17 18:08:13 2010