I have a Wheatfield Audio HA-2 headphone amp with Senn 600 headphones.The Wheatfield is a tube headphone amp of superior quality.Check them out at:www.headphoneamp.com
I use a Musical Fidelity XCans V2 tube headphone amp with my Sennheiser 600s (about $270 new I believe). I find the combination great, and prefer it to the intenal Headroom headphone amp on my Sonic Frontiers Line 3. Good luck.
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