Lots of opinions so far. Look at the Line Magnetics amplifiers. All sound starts with the transformer and they have really good ones. Most of the others recommended above are so so.
Happy Listening.
Tube amps under $7500
Ready to experiment with combinations never before (or not recently) tried. Step one requires a tube amp. Now looking at Prima Luna EVO 400 which sells for 5K. Any other tube amps I should consider in this price/feature range? Must come in silver with balanced input. For pairing experimentally with various tube and SS preamps. Efficient 4 ohm Legacy speakers (and the room/setup) are the constants.