Carver 275 Crimson tube amp --- any feedback appreciated

Frank,
Thank you for the information.  I am not sure that I need to check my "neighbor's tubes", but that is an intriguing idea.   It is evident that the amp runs in such a fashion to ensure long life to its tubes, which is are major factor in my decision to buy one.  

I have never heard of a process to "repair" defective tubes.  If you have such a process, I have about 60 rare NOS tubes that would be happy to see renovated to their former performance if you can do that.  I am keen to hear some reports of folks that are using the 275 amp in their system.  

I’d be curious about the Low end (bass) of the 275 when mated with very efficient speakers like my Zu Omen defs. My biggest hesitation on trying avtube amp is lack of bottom end. I really like deep bass

Like most tube amps, higher impedance speakers are better matched to Don's amp. If your speakers dip below, let's say, 4 ohms, then I think it would not be the best match.  With my 12 ohm Spatial Audio speakers, the bass is reproduced extremely well, pretty much as well as with my 100 wpc McCormack amp.  To my mind, that is a huge accomplishment because I have never experienced such low end response in a tube amp as I have with Don's amp. 

The question to ponder is whether or not your   Spatial Audio Hologram M4 Triode Master speakers need an amp with high current output and control that SS offers. Like your DNA-0.5. If they do, the Carver will certainly fall short. I tried driving my restored, very current hungry German Physiks Borderland MK1 with my Carver VTA180M Cherry monoblocks, and it was dull and lifeless. I took a shot and bought a McCormack DNA 1.0 with rev B upgrades and the GP's came alive. Was so happy with the synergy that I sent the amp to Steve for a full upgrade including the Plitron transformer. The Cherry's went back to my vinyl rig. I'm thinking the best attribute about the Cherry's  driving my Legacy Focus SE's was that they were dead quiet and run super cool. Carver lifts the grounds by using only a two prong plug. And although the focus SE's are very sensitive, as far as the mid-bass and low end bass is concerned, the Cherry's "just run out of iron" and the mid range is somewhat smeared and lacks detail. The highs are just OK. Now that's MY system. YMMV. Well the itch came back, and decided to sell the Cherry's, and they will be replaced with a Wells Audio Innamorata. My front end remains tube though, and its going to be an interesting experiment driving the Wells with a Dehavilland UV3 and Fosgate Signature phono stage front end. When using the Carvers, of course go by what your ears say, and not the published specs, because Carver tends to always "exaggerate" his performance specs.                 

Jaynmo,
The M4 Turbo S speakers which I first had had an impedance of 4 ohms, which of course was a poor match for my flea-watt Dennis Had amp.  However, with the M4 Triode Masters, Clayton has modified the speaker to present a 12 ohm load, much more favorable to a tube amp.

I have Don Sachs' tube preamp and i got a chance to audition his Kootenay 120 tube amp last week in my system, which has 65 wpc.  I, and the audiophile who bought Don's amp for us to hear, both quickly and decisively concluded that we greatly preferred the SQ of the speakers with Don's tube amp compared to my very fine SS amp.  (As an aside, he went home and ordered a pair of M3TM to replace his $8500 "box" speakers, feeling that the OB speakers had an openness and expansive soundstage to which his conventional speakers could not compare.)

With the tube amp, the music was presented with luscious liquidity and, most surprising to me, a potent grasp of the low response.  The instruments were palpable in the expansive soundstage.   I was pretty much blown away as I have never heard a tube amp with such authority and extension and such a natural presentation of the music.  I conclude that this performance is a function of the 12 ohm impedance of the Triode Masters -- a much more compatible load for any amp, either SS or a tube. YMMV with different speakers.

Don's amp is sweetly compatible with my speakers, but I am intrigued with the Carver for its long tube life and its affordable cost.  I frankly doubt it would sound as fine as the Kootenay amp, but I would sure like to hear one for comparison purposes.

I heard the Immorata auditioned by Jeff Wells in his listening room some years back, and couple of other times at audio shows, and came away with the impression that his amp provided a glimpse of the finest amplification that one could ever experience, pretty much regardless of price.  I wonder how my Platinum-upgraded DNA-05 would compare to the Immorata?

Thanks for post.