Can't comment on the sonic quality but it sure won't hurt anything. Neither the amp nor the speakers will be harmed.
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I am in the same boat. I sent my preamp out for mods and my amp out for repair. In the meantime I picked up an older Sony ES 80 watt reciever on eBay and it is doing a good job driving my 6 ohm 86 db NHT classic fours at low to moderate volumes.
So basically I would say your fine as long as you don't crank it.