Matching up speakers and amps

I have no first hand knowledge of Spendor speakers, but I recall reading a review on Musical Fidelity's current M6 product line that specifically mentioned a couple of speakers that pair very well with M6 components. One of the speakers mentioned was the Spendor S9, so to the extent that the A5 may have similar characteristics to the S9, then the Musical Fidelty M6PRX amplifier would probably be a good pairing. The review I am referring to was by Alan Sircom and published at avguide.com.

I use the M6PRX with B&W 804 Diamonds, which is a combination that I like although it is not one that Sircom mentioned. I suspect a used M6PRX would be in the vicinity of $2500 or perhaps a little bit more. It's an outstanding amp that you don't hear much about, which is a little surprising given several absolutely glowing reviews.

The only caution I have about the M6PRX is that does run on the warm side so it's definitely not an amp that I would place inside any kind of cabinet.

Steveaudio: Actually, I have no issues with the sound of my system, just that I have had the McCormack and the Acurus pre amp for 13 years and I'm itching to try tubes!

You should go ahead and do that then. The Spendors have usually been tube-friendly.

*Actually, I have no issues with the sound of my system, just that I have had the McCormack and the Acurus pre amp for 13 years and I'm itching to try tubes!*

Easiest thing: Get a tube pre-amp. Like Mechans said, a used ARC, C-J, or Cary, you could add VTL. I have a wonderful Cary SLP-98 pre-amp, but paired with a SS (C-J) amp. Depending on what kind of sound you want, you can get some pretty nice used tube pre's for $1000-ish. Want kind of "tubey"? A VTL 2.5TL, or older C-J. Pay more, like for a more modern C-J or Cary, that's a different sound. "Better", more neutral, but still will add some "tube warmth".

Tube Power amps: that's a whole 'nother issue. Make sure your speakers are fairly efficient, & "tube-friendly". I'd start with a tube pre......

IMHO, the Acurus is the weak link, and though not because of that, the least tube like sounding component in your system. It would seem that the Acurus would be the component to consider replacing with a tube unit. But a bit of caution might be in order. I can't seem to find the specs on the DNA .05, but different models of McCormack amps had various input impedance's and sensitivity. Some had input impedance's that might be a bit low for some high output impedance tube pres, and others had a rather high sensitivity for some of the tube pres that have higher output, compromising the usability of the pre volume pot. Using a tube pre can work, and work well, but as always do your homework first.