GE 17T026 pincushion distortion

[Down Under]

Hi guys,

I'm bringing one of these back to life and everything is now ok, except terrible pincushion distortion. It's far worse at the top (horizontal lines) bowed downwards at the centre), but all four sides are squashed inwards to some extent.

I notice that the yoke has no magnets fitted, or even areas that look like magnets should be there. B+ is where it should be and the picture is nice and bright with no blooming.

The CRT is a rebuilt tube, is it possible that there were round ferrite magnets taped to the tube that were never put back?

Any help/advice appreciated.

Cheers,

Adam