Audio Research and Martin Logan Montis

My 21 year old solid state amp is developing some hum issues and the price to ship and fix it would be more than the value of the amp. Has anyone had any experience driving the Martin Logan Montis with Audio Research amps.
the Montis is rated at 4 0hms, but it varies widely, down to .5 ohms. It is pretty sensitive at 91 db. Am considering buying a Ref 75 before the upgrade.
Regards,
Robert