ITA Tuner Service sheet sent.
Re: line linearity...
1: Adjust C25 (underneath). Set this for maximum width
and brilliance without any vertical white lines becoming apparent.
2. Adjust the 'width' slider and the line linearity adjustment (through hole) together for best overall effect.
3. Adjust little capacitor C33 on top of scan yoke for minimum kink at extreme left of picture.
4. With the set switched off, check the core of the line output transformer isn't really hot (it's OK if it's 'warm'). These transformers suffer from rusted laminations - a hidden condition. If you're really unlucky, shorted turns are a possibility.
5. Check the condition of the PL38 line output valve and the ECL80 line oscillator.
6. Check the PZ30 is OK on both its sections.
7. Check other components in the line output stage, particularly C30 and C31 and C34.
HTH
Steve