I think the bass issue with the HD800 bass is a function of them being voiced neutrally and also having a skewed impedance curve.
If you look at the impedance vs frequency response graph on the Headroom site, impedance hits 650+ ohms in the 100hz - 200hz range, which is a huge deviation from the nominal 300 ohms spec. I'd therefore expect that quite a few amps will struggle in this area. AFAIK, tube amps usually prefer high impedance loads so your positive experience doesn't surprise me.
I have a preference for solid state so I'm looking into one of the SPL amps (Auditor or Phonitor) as they are apparently capable of driving the HD800 properly. My Sugden Headmaster pairs nicely with them but the bass could do with a bit more heft.
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