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Old 4th Jul 2013, 8:08 am   #57
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Tektronix 465B Scope - Some problems.

Shorting the plates will determine whether it is deflection of the beam or whether it's a focus problem. Only one pair need be shorted, because if it's noise ingress, shorting the Y plates will reduce the fuzziness in the Y dimension and should leave a horizontal line.

I've seen a lot of CRTs with internal damage due to shock... all deliberate! There's a military shock test that involves a controlled drop, and virtually no electrostatic deflection CRT can pass it. The mass and cantilevered support of the deflection plates is a weak point. Protecting scopes from knocks is a very good idea.

David
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