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Old 5th Jan 2012, 6:30 pm   #17
glowinganode
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Join Date: Apr 2009
Location: Aylesbury, Buckinghamshire, UK.
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Default Re: Cossor CDU110 'Scope: Brightness Probs.

Ah, sorry Anthony, I didn't see the second page of the document.
Maybe the tube is getting low on emission.
Do you have a variac with over wind on it so you can increase the heater voltage and see what difference that makes?
Rob.
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