Philco Predicta 9L37 chassis horizontal output tube red plating.

[Tom Albrecht]

And be on the lookout for broken tube socket contacts -- I recently had a failure of the 6CG7 socket in a Predicta I worked on.

3300 pF is 0.0033 uF.

I've done several Predictas and haven't had a bad couplate yet, so that would not be my first priority.