Which First Watt would you recommend to the owner of high efficiency speakers (101db, 16 Ohm) ? Currently using push-pull tube amp designed (OEM) by Trafomatic Audio for WLM Acoustic back in the days.A lot depends on your preamp as the single gain stage units need more drive. I'd be looking at one of the 20 or 25W units since they will be making less power than that into 16 ohms.
FWIW a speaker like that is ideal for tubes. We make a 30-watt/ch OTL that would work great on that.