What are few good amps currently for Sennhieser HD6xx (HD650) under 300 USD ?


I like warm spacious sound and lush vocals. I dont like sharp highs.
I am in the market for some tube amp for HD6xx. Currently I use a basic solid state amp and the sound out of 6xx is intimate. I want to widen this soundstage considerably. Any tube amp recommendations under USD 300 ?
dragonballz
The Cavalli Hybrid CTH amp has garnered some very positive reviews from fellow HD6xx owners so that’d be one to look at.  For a pure tube amp there’s the xDuoo TA-10R, or if you can stretch a bit the TA-20 that may be worth exploring too.  Hope this helps, and best of luck in your search.