Looking for preamp which is good at BOTH single-ended AND balanced output


I am looking for a preamp which sounds good at BOTH single-ended or Balanced output. My DAC has both single-ended and Balanced output. I have vintage tube amps which only allow single-ended input. I also have SS amp which only allows balanced input. I use both amps alternatively. Sometime I even use both together for bi-amp setting.

Is there any good used preamp under $3000 recommended? I have opportunity to get BAT VK-30SE or 31SE, I know they are good for balanced output, are they equally good for single-end output?
ccheung

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