Good headphone amps for Sennheiser HD650

Little Dot MkIV Update:

After I continued to proceed with burn-in process with Little Dot amp; fortunately I could get sound quality back; and tad bit better at that. I'm sure there is recognisable change as I realised the previous switch gain setting weren't working out now I had to lower the setting to make it better (I should say the switch gain setting is indispensable as it helps to customise the sound output).

I think now the output is more fluidic and 'transparent'; probably sweeter. I guess I'm slowly getting to understand the "tube" sound.
 
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