My trusty Sansui AU-999 still delivers the goods. Has specs for delivering 70 watts at 4 ohm load. Drives my DLKs perfectly.
Vintage amplifier specifications
I've noticed when I read vintage amplifier specifications, and by vintage I mean 70's,80's maybe 90's, I do not see power output specified at 4 ohms. Did those older amplifiers not do well on 4 ohm speakers so leave that information out or was it not considered a a matter of interest to the buying public. Maybe something else?