Which loudspeaker??
Judging by yr info, go for any 40+W rms /4ohm, spec'd amp fm any reputable manufacturer (Wavac, Nagra, Kr Enterprises, ??). 8 series tubes or 211 tubes or 610 tubes. That's quite a choice... whether they'll play music with yr particular spkr is another matter. They'll drive it though:)
Judging by yr info, go for any 40+W rms /4ohm, spec'd amp fm any reputable manufacturer (Wavac, Nagra, Kr Enterprises, ??). 8 series tubes or 211 tubes or 610 tubes. That's quite a choice... whether they'll play music with yr particular spkr is another matter. They'll drive it though:)