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Old HP 140A oscilloscope

Question asked by haamer on Feb 27, 2010
Latest reply on Oct 15, 2010 by Frank_BR
It was made in 1963, so I have replaced all electrolytic capacitors and everything works, except one clitch: when I adjust beam intensity brighter, then also signal amlitude grows at CRT.
At max intensity sinewave or square seems to be 2 times bigger, then at minimum intensity.
Very annoying.

Any suggestions, what can be problem?
Thanks
T.  

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