One of the suggestions by ccshua was to solder the earth wire from the HDAM to the RCA earth leg. I'm guessing this fixes some or other issue with voltage or current as the sound becomes more punchy and clear.
Since I use the Zero only as a DAC, I unplugged the head/pre amp as it was a waste of energy not to. Didn't notice any significant change in SQ as a result though.
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