Tube Amp Suggestions

In the 2 to 3k used price range you have your pick of all but the best tube amplifiers and even some quality single ended triode moderate powered amps suitable for your speakers (like the Cary 805b).

Cary 805B monoblocks are close to 3k used and give you 50 single ended class A watts..very good amplifiers..

McIntosh MC240 (40 watts), mc275...work well with a 4 ohm load due to the McTransformers..nice sounding amps that will retain their value if you do not overpay. 1000 to 2500 used

Bruce Moore Dual 70 tube amp...I only remember this guy makes really good stuff is the reputation.

Air Tight ATM2..very good amps

Canary CA300 monoblocks..think this is a push/pull class A 300b amp that makes good power...

BAT VK60 about 2000 very good amp

Audio Research VT60, VS55

Melos Audio MAT180

Lots of choices; there were more. There are examples of all of these for sale as of this writing. A quality 845 single ended amp would make about 22 to 25 watts depending on design; that would be sufficient for your speakers as long as they do not present a low resistance that varies a lot.

The Cary 805 for instance, has a limited frequency range (only 20hz-20khz) and they do not even mention distortion in their specs. That cannot be good.

For inaudible distortion you want a min of <0.1% THD, IMD, over a 5hz-50khz frequency range. As well as Outut Impedance <0.4 ohms.

The Canary is more like it, but notice: 8w

McIntash models show <.5% THD but only over a 20hz-20khz

No mention in your post, but Rouge also has decent specs and ample power. That is, a 40w tube amp is approx equivelent to a 100w solid state.

It is not that easy to find distortion free amps, especially tubed units. By far the majority of mfgrs do not come close.

No wonder the myth is perpetuated that specs do not matter. So few meet minimum requirements for inaudible distortion. Insteade they glorify their distortion qualites in poetic terms and sell the dream preached by the 'connoisseurs of colorations' magazine reviewers.

I wonder how many mfgrs will advertise in a magazine that gives their products unfavorable reviews. It does not sound like good business.

I wonder how many reviewers will remain employed when mfgrs begin pulling their advertising based on their unfavorable reviews.

While the Canary CA-300 is an 8 wpc SET, their CA-301SE is a 22 wpc push-pull amp that has very attractive specs and build quality. It may be available used within the original poster's budget, but Canary 300B p-p amps seem to be rare on the used market. I can understand why - after my experience with them I'm very enthusiastic about the company and their products.

Though the CA-301SE is getting there, and better than most (the 10 Damping Factor is a good sign) still at THD <0.5% (over a very decent frequency range), it still is noticabley over a cutoff of <0.1% THD.

An excellent ss amp for instance is typically more like <0.005% THD, and IMD. And at 22w... what can it drive?

I mean, you do not HAVE to go tubes, and in my opinion, it cannot be worth to add distortion.

Agree with the comments on AtmaSphere, great amps, just not with these speakers. And, my experience with mine has shown me the Zero Autoformers that a lot of people will point low impedance speaker owners towards really bleaches out the sound and takes the magic of the Atmas away.

My other pair of tube monos, the Granite 861s would be flat out fantastic. I listen to a lot of gear, and this little company makes about as good a pair of tube monos that you will come across. I felt strong enough that I bought a pair.

Also like the Cary V12, which I have personally heard make nice music with Audio Physics. And the BAT VK60 must always be kept in mind whenever someone is looking for a nice tube amp.

Not that I am not a fan of Rogue 120 amps, but their level of refinement is a definite step or three down from the amps listed above.