Welcome to the community @nikosgrpir
Your amp uses 100 watts min. and goes upto 1200 watts. P15 would allow for power amp, source and preamp. However, if you believe the 302 sounds better off the mains, then a P3 would serve your source and preamp.
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Thanks Sehran for your hints, are realy-realy helpfull to my hi-end journey!
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Agreed with Serhan, that JR 302 is a big, power hungry amp. P15 would likely do it, but I’d rather get the P20 and have headroom for the rest of your gear. If you like the JR going straight to the wall, the P3 can support your source gear no problem.
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Thanks Jamesh for your reply is also helpfull, my best greetings from Greece!