Mark,
As tswista says the Coincident Frankenstein is a superb sounding SET amplifier that would IMO work well with your 97 db sensitivity 16 ohm (very easy load speakers). . If a used Frankenstein is not available in your price range consider the Coincident Dynamo latest version the MK III. Ii is a singled ended class A circuit so a different approach compared to the push pull amps suggested above. It is available as an el 34 or as a 300b based SEP 8 watt amplifier.
.I believe this type of
pure class A single ended amp would mate wonderfully with your Altec speakers. Good luck to you. Two different pathways , no NFB class A or + NFB class AB circuit. Either can be very good but different.
Charles