MS8-26 width issue

[geekmiki]

Hi,

So my previous MS8-26 decided to die yesterday and while I fix that, I thought of using my spare chassis to get the cab running. The chassis works fine, but adjusting the width is being difficult. I tried the ferrite "trick" that I did with the other one, which consists in adjusting the ferrite as much as you can, turn off, put the ferrite again to the middle and start again until the desired width is achieved. But that doesn't work on this chassis. When I reset the ferrite I also reset the width.
B+ is 92VDC
Width plug on the chassis is on "wide".

Any ideas on how to get a proper width adjustment?

(The picture shows the max width I managed to achieve)

EDIT: I guess it's worth to mention that the original chassis was a MS8-26SG and the spare one a MS8-26A. Which I suspect to be the issue here.

 

[geekmiki]

After more research, it seems that the spare chassis I have might not even be a MS8-26A, but some other revision that I haven't managed to identify.
I'll post some pictures, in case anyone manages to identify it. Biggest difference with the SG is the missing component right in the middle of the PCB.

MS8-26SG (the original one, that died):

The spare one I have that has the width issue. It is an MS8-26, but which revision?

 

[ExZX]

Your second ms8-26 chassis has no pin cushion circuit. Is your tube a A63JHF81X?

Read that thread: https://forums.arcade-museum.com/threads/ms8-26su-and-ms9.500253/

 

[geekmiki]

Yes, the tube I have is a A63JHF81X.
Thanks for the info. Since modding that chassis seems like a PITA, I guess it will soon be up for sale.
Also it seems to be a MS8-26SU.

 

[ExZX]

Yes, the tube I have is a A63JHF81X.
Thanks for the info. Since modding that chassis seems like a PITA, I guess it will soon be up for sale.
Also it seems to be a MS8-26SU.

Seems to be a MS8-26SU? Nope. Modding the chassis? Fuck no.
I gave you the info that you need to identify the chassis on that thread and help you. Maybe take the time to read it? Thanks