Out of the box this is a rewarding and enjoyable auditory experience. The price belies the value you are receiving. This amp is dimensional, tonally very musical, i.e.: as in real music.
Probably one of the best audio buys I've ever made and I've always been a solid state guy. This amp just makes magic with HD-650's.
The image is fairly dimensional, with a wide, deep and high soundstage, which allows you to sense the relative positions of the instruments and performers. The amp positions the listener fairly close to the performance with a more intimate sound – closer to the front row, or stage, than to the back rows.
* 1 pair of drive tubes, and 1 power tubeare included.
* AC Power cord and RCA interconnect cables are not included.
* Shopping cart applies to the U.S. buyers only. International buyers please contact for shipping cost and payment instruction.
Power tubes upgrade:
Tung Sol 7236 NOS $80 each
One of the best power tubes available for this amp. The 7236 vastly improves dynamic and soundstage. It has a very good speed, warm mid range, tight and deep bass. Buy and ship separately.
Driver tubes upgrade 2:
Hand-pick matched pair
Amperex 6922 Gold Pins, Holland made, matched pair $200 (2 pcs)
Ultra low noise and low microphonic, deep, clean bass, excellent extension on tremble, full body mid range.