Ola wid
Biasing is infrequent and easy with ASL amps with their beautiful meters. Tubes last a long time and changing tube type changes the sound - tube rolling is fun. 5 wpc is more than enough for the M3s, it certainly is enough for the M22 like, Michaura M55s.

The sound of a good tube amp (not necessarly an expensive amp) is great ... really great.

JMO

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.