Mtc 900 width adjustment

[stevebm1]

Hi,I have just tube swapped a hantarex mtc 900,the old tube was 19”,the new one is 21”,yoke readings were fine and the chassis runs with a nice image,I have tried adjusting the width coil and pots,but the image is still too wide,Im sure I read somewhere years ago that you can change cap 69 to a different value to solve this issue,is this correct?,and if so what new value cap do I need?

Thanks in advance

 

[gunblade]

guess depends on how much you need to go, try a 560nf or 680nf
checked the b+ is correct?

 

[stevebm1]

Yes b+ is dead on 130,I did read you can try lowering it to 115v on Klov,but not sure if that is a good idea?

 

[gunblade]

900e are 126v
900usa are 115v
you could try 120v

 

[stevebm1]

Ah,so maybe the b+ is a bit too high?

 

[gunblade]

whats the exact version chassis?

 

[stevebm1]

Mtc900-E

 

[gunblade]

try it on 120

 

[stevebm1]

Well had a chance to fiddle with this earlier adjusting down to 120,v and things were 95% better,so I went a bit lower at 115v and it’s now a perfect fit to the screen.
The question is,am I ok to leave it running on 115v or should I change cap 69 instead?

 

[gunblade]

leave it on 115, the 900usa work just fine on that are they are virtually identical to 900e

 

[stevebm1]

Thankyou for your advice,you have solved the fault once again