Member's recommendations for tube amplification

+1 @noromance

I picked up a pair of the Coincident Frank mkII monoblocks last month, and these have become game-changing amps for me, after owning a multitude of other amps. Perhaps the end of the line, so to speak, for me.

I am using them with my Omega Super Alnico HO speakers (97db). They are NOT the stereotypical warm, euphonic 300b type of amp, but they are rather a dynamic, fast, open amp, that sounds a lot more powerful than the 8wpc rating. I highly recommend them for efficient speakers.

@atmosphere 

For what it's worth, I filter out 70Hz (-3db) and below (-12db @35hz) from the amps and speakers (using a pair of passive filters) and I am letting my ML Depth i subwoofer handle the bottom range; IMO, this has worked wonders in driving the Omega speakers with the Franks with substantially less distortion; I don't detect any distortion, but if there is, I have no objections to it :)

@atmosphere

You got me thinking Ralph, so I wanted to check the output of my Coincident amps with my 97db, 4-6 ohm Omegas.  This is a very crude test since I don't have any engineering test equipment other than a multimeter, so some assumptions had to be made, but here is my summary:
- I played a 1Khz test tone (sinewave) at 90db in my listening spot (damn that was ear piercing, so I put some plugs in my ears, lol)
- My meter read 2.26 Vrms at the speaker terminals
- My calcs show that I was using between .85 and 1.3w to output the 1kHz wave, which places my amp's power output (out of 8wpc) usage somewhere in the 11% to 16% range, which is inline (actually less) than your 20% spec for SET amps.

Does this hold water and put me in the ballpark, or did I miscalc somewhere? What am I missing?

Obviously real world audio is way different from a simple sinewave, but then, I don't listen at a steady 90db either, and I do filter off the low bass from my amp/speakers, which helps immensely.

All in all, these amps really work wonders in my situation.