I second all of the above replies. The SA3000 was a pretty decent unit, but a SA5000 or a SA-5.1 would beat it pretty easily, IMHO. Mostly due to the tube rectification in the power supply. Tube gain stages are nice, but a tube regulated power supply makes a big difference.
FWIW, both the 3.1 and the 3000 had transistorized power supplies.
Cheers,
John
FWIW, both the 3.1 and the 3000 had transistorized power supplies.
Cheers,
John