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Connections get bad, pots get dirty and intermittent. Insulation deteriorates. We all know about the old caps. One thing I didn't expect, but found on the CTC-5, is that many of the carbon comp resistors are higher in value than rated - but I'm not going through and replacing every part unless it really causes a malfunction. At one point, the power-dropping resistor for the tuner went up in smoke - for no known reason, as the tuner draws the correct power now that the resistor is replaced.
I know - Gremlins!
Regarding the flickering at low contrast/brightness, one guess could be the high voltage regulator circuit - you might try changing the regulator and/or checking resistance values in the horiz sweep and high voltage section.
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