I've used my Altec 14s with the tube McIntosh MX110Z & MC240 units, the solid state MX113 & MC2505 and even the MX113 (SS) & MC240 (tube) - all with great results.
But believe it or not, the very best Mc unit for bringing out all the Model 14 has to give is the MAC1500 (tube) receiver with the LOUDNESS switch ON. That loudness curve Mc used in the MAC1500 seems to have been made to go with the natural LF/HF rolloff characteristics of the Model 14s. Yowsers do they ever come to life with that receiver.
The loudness switch on the MX110 doesn't come close, much less that of the MX113 which is practically useless because it affects the LF only, and a massive boost at that which only serves to muddy up the bottom end.
I think the less expensive MAC1700 might do similar justice to the Model 14 since it's likely to have the same loudness contour as that used in the 1500's loudness circuit.
The SS output section of the MAC1700 (the reason for its being significantly less costly than the 1500) in my view will have little bearing since I haven't noticed tubes or SS having much difference between the MC240 & MC2505 when used with the Model 14.