The best vintage solid state amp and preamp Luxman made, in my opinion is when Luxman was under the ownership of Alpine/Luxman see below. FWIW: I bought brand new in 1977 two Luxman B-12 monoblock amps and a Luxman C-12 preamp. They were the Laboratory Standard Series before the Alpine buy out. The better line at the time was the Laboratory Reference Series but my budget would not allow for it.
Mike
Luxman twin-monolithic preamplifier C-05 & pure Class A power amplifier M-05:
( $7000 )