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Forum 141

Another Biffa TV22

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Black & White Television

Last Post by peterscott 5 years ago

65 Posts

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peterscott

(@peterscott)

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Still got rubbish line linearity and uneven focus but I think I'll leave it that.

Peter

www.nostalgiatech.co.uk

Posted : 17/09/2019 10:25 am

PYE625

(@pye625)

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I think it is pretty good and best left alone. It is one hell of a lot better than when you first started. ?

To understand the black art of electronics is to understand witchcraft. Andrew.

Posted : 17/09/2019 4:58 pm

peterscott

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Thanks to Till on line drive and Lloyd on a better ion trap magnet I've got reasonable linearity and better overall focus.

Peter

www.nostalgiatech.co.uk

Posted : 17/09/2019 6:56 pm

peterscott

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Still not quite there on the line scan but got improvement with a different combination of linearity transformer and line drive. The frame linearity was just leaky caps that I hadn't replaced. Picture centring is still on the margin but maybe if I can increase my ion trap magnetism I can get the improvement that Lloyd suggests.

Peter

www.nostalgiatech.co.uk

Posted : 18/09/2019 11:11 am

peterscott

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Posts: 1028

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My picture centring wasn't helped by me not swapping C34 and consequently running a little leakage current through the scan coils also the line linearity screw had become detached from its slug.

Peter