Altec Lansing Model 19

70's transistor amps were pretty crap sounding and using them with any horn speaker is a very bad idea. Even by today's standards The Altec 19 is a very competent speaker and deserves the best electronics you can afford. Ideally a tube amp with guts, the 19's woofers like to have some current or they'll sound loose and tubby.
david

I know Shindo mates well with the Valencia 846A, which is the 16 ohm version. I can't speak for 19's. I do know someone who had 19's and Shindo, but I'm not sure if it was at the same time.

2a3 Push Pull.

Thank You all....I had for a while a pair of 14 driven with a miserable full amp dated 1971 by National Panasonic! (50x2) I can tell you that my Krell FPB 700cx could not sound better than the Panasonic!lets say my system sounded worse than Nationa1! unlistenable!! I believe the eletronics from the 70s are much better suitable for 70s speakers. Certainly are electrically dated but they have an xtra gear musicality and match better with speakers from those days! what do you think!?I'm not subjective but objective!

Since you're interested in a "one box" integrated amplifier, I would consider either Leben model., 300 or 600, and they are very affordable, as I would go tubes
Even though your Altecs are in pristine condition, you should really consider the crossover upgrades that many have done with great results.
Information is easily found online.