McIntosh MX 119 Preamplifier vs Adcom GFP 750

That might be speaker dependant, but I've got silver solid core IC's from the freya to the amp, and Morrow silver plated copper on the cd player.  With the tube section engaged, it gets really captivating.

The 750 is quite old now, devices eventually drift out of spec.  I would avoid that.

If you're looking to spend 800-900, there should be some pretty good options.  I'd suggest a brand new option.  If you know anything about crosstalk, SNR and other specs, the Freya + by Schiit Audio has stellar performance.  

It's also a tube preamp, but it has two other modes of operation in which the tubes are not engaged.  The sound is so transparent its jaw dropping at times.  I've got it with a solid state amp and the combo is end game.  

How long do the tubes themselves generally last ?
Do they all degrade at the same rate and just replace all of them when its time.
The other solid state I’m considering is the McIntsosh C47.
thx
for info

I think they would wear at the same rate, generally speaking.  The Freya+ doesn't have a phono section though, you'd have to get a phono preamp separately if you're into that.