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Caps are fine, I have a TRC47 since 1976 . never a problem.
There is a tiny , very tiny pot you can adjust. It will get you up to 100 % modulation.
Power not so much
I found this from England, looks like the right one.
https://www.ebay.com/itm/192899300629?mkcid=1&mkrid=711-53200-19255-0&siteid=0&customid=link&campid=5336136228&toolid=20001&mkevt=1
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