[mulveling]

I agree. The best way to get the toob sound is with a good tube amp. There really is a difference. The RKV and Singlepower SDS are the only tube amps I've used, and both are excellent (the SDS moreso, but you pay for it).

 

[cpw]

If there's still a chance of your going over to the tube side, consider the Eddie Current offerings or, if you can afford it, the Raptor. If not, I stand by my initial reco of the HR-2. It's a quality amp you can make as toobey as you want through diffferent opamps.
NO FEAR!
=CPW=

 

[jimmyjames8]

The Eddie Current amps are interesting and priced right. I also looked at the Little Dot offerings. The Single Power MPX seems to get the most votes of confidence around here. I really need to audition a toob amp with my 650's. Little flashes of brilliance last night with my Pimeta. Still only 1 vote for the M^3?

 

[bhd812]

the 650's love tube amps and they love them good!

if you go tube amp just make sure it can drive any set of cans perfectly just incase you go with something else down the road.

 

[Thaddy]

While the Eddie Current amps are wonderful, I don't think they are made anymore. They usually go for absolute bargains in the For Sale forum, but they don't pop up much.

As for the Singlepowers, you really can't go wrong with one, no matter what price range you're in. Get a decent set of tubes and get ready to hear your HD650's sing

 

[Solude]

Another option would be the Rudi RP33. It is reportedly very smooth and warm. I believe Sovkiller and Nik have heard it.