having been out of headfi for a quite abit, i decided to dive right back in by acquiring a pair of HD800 (serial# 13xxx). all i have (for the moment) is a diy OPT tube integrated amp (el84 & 12ax7 not sure what type nos as print has flaked off) costing me about $300 or so in total. i could be wrong but it think it outputs 7watts max. i deliberately held back from posting til i have a couple of weeks of on/off listening.
im rather pleased with the result. lots of range & details, upfront intimate mids (vocals), great imaging, soundstage & depth with plenty of tight (though rather fast) bass slam. its the 1st headphone that reminds me most of my fullsize speakers or rather, i should say i dont miss the speaker when listening to the HD800s.
what i do hear is a slight brittleness (or hardness or glare or grain or.... lol) that i do believe is mostly attributed to the quality of recording as i hear less of it in MSLF/Chesky/Sheffied recordings. a slight attenuation of the higher freqs (or brightness) & a bigger bottom emphasis would be just about purrfect to my ears atleast. for sure, my speaker rig is smoother but then again, i dont hear as much microdetails (atleast not as easily) with the speaker rig either.
its pretty amazing what $300 buys in an amp to drive these HD800s. that said, the curiosity bug in me ordered a reconditioned vintage early 60s Fisher 400 receiver to take a gander at driving the senns. for $500 shipped, i thought it was a safe bet even if it wasnt a synergistic match.
& for the piece de resistance (to the chargrin of my better half ... hey i convinced her by simply stating its a better and cheaper habit than gambling!!! lol) & so with the "in for a penny in for pound" carelessness, i couldnt help myself but bought a Audio Space 300b for a taste of delicious 300 type (though PP & not SET) goodness which should arrive in a week or so. for what its worth all 3 amps together still comes under the $2.5k benchmark as set in the OP.
as a bonus, i can easily power a set of vintage Klipsch Heritage or Wharfdale E's or JBLs with either of them amps! regardless im already super impressed & love how the HD800s sound from the cheapie diy amp. cant wait to see how much more(if any) the other 2 "newcomers" would bring to the table. would be glad to update further if any curious minds here have a need to know.