ArcadeMachinist
Professional
Good day, masters!
I have recently aquired 2 nice Naomi Universal Cabs and one of them has weird monitor problems.
The picture is compressed when it is just powered on, but after a few minutes, when it warms up - it becomes so wide and tall that it does not fit the screen.
I have tried front panel adjustments, I can scale the picture while it is cold to look normal, but when it has warmed up - even if I turn the pots to shrink it to the minimum - it is still to big to fit.
Cold start:
Zoom in
Warmed up:
Zoom in
Any ideas where to look at?
As it depends on cold-warm state of the tube - I suspect it is not just adjusments, but some failed components.
Also if anyone has understanding on CRT chassis <--> Tube matching, I would be grateful to hear.
I understand that yoke V&H resistance should match, but what else makes tube compatible with a given chasis?
I have recently aquired 2 nice Naomi Universal Cabs and one of them has weird monitor problems.
The picture is compressed when it is just powered on, but after a few minutes, when it warms up - it becomes so wide and tall that it does not fit the screen.
I have tried front panel adjustments, I can scale the picture while it is cold to look normal, but when it has warmed up - even if I turn the pots to shrink it to the minimum - it is still to big to fit.
Cold start:
Zoom in
Warmed up:
Zoom in
Any ideas where to look at?
As it depends on cold-warm state of the tube - I suspect it is not just adjusments, but some failed components.
Also if anyone has understanding on CRT chassis <--> Tube matching, I would be grateful to hear.
I understand that yoke V&H resistance should match, but what else makes tube compatible with a given chasis?