[Amps] suggestion/recommendation wanted for a 'tunable' 15 pf capacitor on MFJ 989C tuner

[A Lawrence Fibich <lfibich@sbcglobal.net>]

There is a tunable ceramic Capacitor listed as 15 pf in these tuners. They are 
on the RF output and provide power for the S Meter. Capacitors in the area are 
rated as 3 KW - I have been unable to find a 'tunable' micro size and wonder if 
simply using a 15pf  3 KW capacitor would work - don't know why a 'tunable' is 
used and can't find one and unknown what voltage would work.  No response from 
MFJ.  ? Any suggestions appreciated.  Apparently with age ? and tuning up an 
amp destroyed this part. Larry FSacramento CA areaW6EF
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