Best tube mono blocks under $15,000?


Currently running McIntosh C2300 preamp and am leaning towards running Mc275s in Mono configuration but I'm new to tubes is there anything sweeter or better out there for the money? Thanks for any input.
128x128epiphanic_audio
Atma-sphere MA-1's should give you everything you need as well as heat your home. As with all amps speaker match is very important.

Power rating: 150 watts/channel into 8 ohms/145 watts into 4 ohms
Power bandwidth: 2 Hz - 75 kHz within .5 dB
Frequency Response: (1 watt): 1 Hz - 200 kHz within .5 dB (-3dB @ 1 Mhz)
Phase Shift: less than 1 degree @ 20 kHz
Power supply storage: 600 Joules/chassis
Output section rise time: 600V/micro-second

Power consumption: 500 watts/chassis
Tube compliment: 14 6AS7s and 4 6SN7s per channel
Input impedance: 100k/ohms single-ended; 200k balanced
Output impedance; 1 ohm
Signal-to-noise ratio -95 dB
The impedance curve of the V2 that is shown in "Chart 5" here indicates that its impedance is around 4 ohms in the mid-bass region, slightly higher in the deep bass and upper treble regions, and rises to around 10 ohms in the mid-range.

Which means that a tube amp having relatively high output impedance/low damping factor (such as the MA-1's, which are presently listed at the Atmasphere website as having an output impedance of 2.3 ohms) will produce a mid-range response that is more emphasized, and bass and treble responses that are less emphasized, than would result with a solid state amp having low output impedance/high damping factor (such as your MC501's).

The MC2301 has a damping factor of 15, corresponding to an output impedance of about 0.5 ohms. Relative to a solid state amp such as your MC501's (damping factor 100, output impedance 0.08 ohms), the MC2301's will emphasize the various parts of the spectrum in a similar direction as the Atmasphere's, but to a lesser degree.

I suspect that a pair of MC275's operated in parallel mono mode would have an output impedance close enough to that of a solid state amp that the resulting impedance interactions would be similar.

I have no idea which kind of response would be preferable to you, or with the speaker generally, but those are some factors to consider.

Regards,
-- Al
I highly recommend that you give the Octave MRE 130's a listen in that price range. You might be able to be find them at dealers for an introductory price as they are just now being carried.

http://www.stereophile.com/rmaf2010/dynaudio_-_wadia_-_octave/

I think you will have some tough decisions at that price point, that is why I suggest that you listen to a variety of amps before you splunk down that much money.

Oh, I also own MRE 130's and can speak of their merits driving B&W N800's with ease.

Ciao,
Audioquest4life