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Adjusting AMEK 9098 mic preamps CMRR trimpots and capacitor?

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Dear Friends

Please forgive me, i'm new to this forum, sol maybe this thread discussed before.
I'm experimenting with a diy mic preamp, based on AMEK 9098 mic preamp schematic.
I'd like to know, is there a good/reasonable method to set the input variable capacitor and the two trimpots(LOW/HIGH CMRR TRIM)?
On the attached schematic the parts: VC1,VR14,VR15.

Source for variable capacitor for LA2a

Hi all,
I bought Dave Jahnsen''s book on making a LA2a and am ordering parts. I also saw Kent stevenson's webpage on making one.

I'm trying to find a source for the varible capator (C4; 50-380pf). Has anyone built one recently and where do you get the variable capacitor from ?

Thanks,
Chuck Hanning
SoundBase Audio