My Grado amp works nicely with my Senn 600's, and it's reasonably priced to boot!
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Hi Skut; I like the Headroom Supreme for away from home as it can be used with batteries or an AC adaptor-- sounds great too, and was once a Stereophile Class B amp. It can also be hooked up to a pre-amp by using tape out jacks, or a splitter into tape out-- Headroom has the accessories. I use it with 300 Ohm Senn. 600s. Cheers. Craig.