Go for it. There are plenty of high quality "vintage" or just older amps that will work just fine with modern processors. Just make sure the amp/amps you choose are in proper operating condition. I have owned at least 30 outboard amplifiers and none newer than 12 years old at the time I purchased them and only 3 of them required any type of repairs. I have been using an Acurus A200/A200X3 combo with my NAD T175HD pre/pro for about five years and they have been trouble free and I have had no reason to replace the Acurus.
As with any older/vintage electronics, if possible, have a qualified tech give it a once over before putting it into operation.
Bill
As with any older/vintage electronics, if possible, have a qualified tech give it a once over before putting it into operation.
Bill