I have had most of Dodd pre, from the oldest 4 tube A/C wall plugged to the latest single 6H30 tube with 3 select-able gains.
To me the latest single 6H30 tube sound best.
I have the balanced version in the work for me. : )
Hal, welcome to WBF.
I have 100Ah AGM battery to power my battery gear:
Mac Mini, External hard drive.
Dodd Audio preamp.
Dodd Audio 2A3 PA.
And Pi Audio BatteryBuss.
I might give a HAL MS-2 a try.