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audiolab 8000A preamp, McCormack power amp

I'm trying to drive a McCormack DNA-125 power amp with an audiolab 8000A as preamp (my Rotel RSX-1065 died and I pulled my audiolab 8000A out of a cupboard...)

I have it wired:

source > PRE_AMP OUT
POWER AMP IN > DNA-125

All I get is buzz through the speakers.

Is there any reason this should not work?

Cheers!