Hi Eric,
Think I have another problem now!
A probe shows 1v for 1v52, 2v1 for 3v2 and 5v5 for 7v8 so seems like adjustment needed.
THis could be the A CAL pot needing adjustment.
B probe shows nothing for 1v5 unless I switch to 50mv/cm and then it only shows a minute deflection so I think something is wrong.
This could be that dead FET
I have tried swapping probe leads to no avail.
Both traces centre perfectly by adjusting the vertical and seem to move about the same distance per degree of rotation as each other.
If I switch to XY instead of dual then I just get one stationary spot.
You will, I expect as you have no X input.!
Horizontal movement seems fine and gives full scale with no problem.
Good
All measurements were done on AC and at the same frequency.
Any Ideas mate. Even though I am much happier with a working "A" channel than the "B" it would be nice to have both, but if it comes down to it I will manage with just the "A"
Regards...........Al