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Finding the correct amp for the high impedance HD6xx is extremely troublesome, it would be cool for a manufacturer to say "perfect for the Sennheiser HD650 " anyways...
I've been using this amp with my hd6xx since March. I'm using voskod tubes. Great combo. I just changed the opamp to a burson v5i with a marked improvement in transparency. I also took the opportunity to change the gain to high, which improved the base and dynamics.
I found Fostex HP-V1 exceptionally pleasant with HD650 - just an amazing sound!