Marantz receiver questions


I have a Marantz PM7001 that I'm perfectly happy with, but the speaker wire connections have gotten so sensitive that the speakers often cut out and I have to tinker with the wires to get the sound back.  I tried cleaning--nothing doing.  Worth taking into the shop or time for a new receiver?

I am playing classical and jazz on cds--Marantz CD6006, Paradigm phantoms.  Will I, a non-audiophile, notice sound difference between the PM6007 and the PM8006--worth the nearly 1K Canadian difference?

shostakovich

What kind of speaker connectors are on the cable? I don’t think replacing the PM 7001 with a PM 8006 is worth the investment!

Btw, last line in original post is wrong.  It's a PM7001 that I'm thinking of replacing with a PM8006.

Pardon my ignorance, but do standard banana plugs fit with all equipment?  25 year old Paradigm speakers, 20 year old Marantz receiver--they'll plug right in to this equipment?