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Old 28th Jun 2020, 9:42 am   #31
Heatercathodeshort
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Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,145
Default Re: Marconi 1400 birthday present

The linearity sleeve always becomes detached from the plastic bit.
It's basically consists of a loop of copper foil sandwiched between two sheets of thick paper formed into a circular tube that slides between the neck of the tube and the scan coils. You will have to loosen off the coils to access the loop which may be stuck to the neck. It usually comes away easily.

It's position is critical. If pushed in too far the width will be reduced together with poor linearity. I would suggest that you recover the paper tube and restick the plastic ring. The dirty mark on the paper will show how far it was originally slid inside the coils.

The adjustment becomes critical the further it is pushed in.

It MUST be fitted parallel with the open slot of the paper tube dead straight.
J.

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Last edited by Heatercathodeshort; 28th Jun 2020 at 9:54 am.
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