Tell us how much you want to spend.
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There have been several threads on this question in the not too distant past. I started one in February that provided some good suggestions. (http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1108700500&read&keyw&zzheadphone=amp).
BTW, out of the past discussion, I purchased a Musical Fidelity X-Can V3, which, I believe, has a Stereophile A rating. I liked it over the SS Headphone amps that I auditioned (e.g., Grado). It's a SET amp and uses 6922 tubes. I've swaped tubes and now I'm using Siemens CCa, which provides remarkable detail and clarity. I've also used Mullard tubes, which created a lush and rich sound, but these tubes are in my hybrid integrated and will stay there awhile. The MF X-Can V3 is also reasonably priced. At the time I posted the thread, I was using Senn 600, but I've upgrade to 650s.
The Senns seem to like a good tube amp based on what I've read. I would shoot for the ASL tube amp. Try that for a while. If you have more to spend, but some Walker SST, first, paint all of your connections, then listen. If you still require greater fidelity (or maybe you have a greater budget at the onset than what the ASL tube amp would cost) then buy something better.
Answer to Swampwalkers question: 500.00 or less. I am intrigued by the Earmax pro, and now exploring the Headroom offerings. These amps could conceivably raise the bar as far as dollars and cents. I am amazed by the scope of their products. Talk about ruling an audio niche! My preference is to find a nice second hand amp as my bucks will go further. Please keep them cards and letters coming, and thanks for reading.
IIRC, Moth headphone products are now sold under the Eddie Current (cute, huh?) name. I think there is/was in the under $500 range. You may want to try headfi.org for used amps and reviews of virtually all hp products. And Rocco, if you can stretch your budget to about $700 you should be able to find a used Audiovalve RKV MK2, which is an OTL amp that to my ears has more punch and more definition than the ASL amps.
IMO the Senn 650 has a smoother, richer midbass and better balance than the 600. I find the midrange of the 650 is flowing and the highs are smooth, with a slightly dark presentation. To me, the sound of the 600 is generally similar to the 650; however there are some slight differences - the 600 treble is grainier, the midbass is boomier, and the bass is less robust. I also find the 650 to be more comfortable than the 600 and I have less listening fatigue with the 650.
Also, the MF X-Can does not lack power to drive the 650.
It's one day later and I am savoring all of the suggestions.Some additional snooping on my own has uncovered Audio Valve RKV MK11, Singlepower offerings, enen a Gillmore new offering or the established Little w/ dedicated power supply. In some instances my 500.00 dollar ceiling is blasted, though I knew that would occur anyway. Headroom amps are for the most part unavailable for now, and I guess that their new line won't show for a month or two. Looks like there's a ton of great product out there. Tough choices!!!!!!
Interesting comment that the Zu cable is bright, as I think the Cardas cable is bright & that the Zu is actually mellower & even a little darker than the stock 650 cord. I'll add my agreement that the 650 is a very significant improvement over the 600s, even with the stock cable.
I actually switched from the 600s, which I found to have a confining sound & distant presentation, to Grado RS1s (a very nice headphone with the optional "comfy" pads) until I tried the 650s.