I guess the M22's will sound fine with the Dynaco, but why choose this antique transistor amp??? The solidstate technology was still very immature in that era. You have nothing in them that are "better" than today's el cheapo amps/receivers. Personally, if I were to go back to '60s-early '70s, I would choose a quality tube amp. They may be more expensive, but they have much more "fun factor" inside...

Cheers!