If I 'm not mistaking the phono input does some pre-amping of it's own. So it's possible to blow that channel (or your entire amp) if you connect anything other than a phono to it. At least that's what they've always told me. Could be wrong though...
But this I'm sure : connecting anything other than a phono to a phono input = BAD!
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup