Stumbled on this one while checking out their CM3 mics:
http://www.lineaudio.se/linepre.htm
This only runs on VAC.....not DC.
From their spec sheet:
SPECIFICATIONS 2MP & 8MP Preamplifiers:
Power requirement: 15-18VAC 7-20VA (2MP) 15-20VA (8MP), 50-60Hz
External 230VAC transformer included (120VAC on special request)
I assumed the 7-20VA was what the transformer was providing. So what does VA stand for
If it is AC fed through a mini plug, then I doubt it passes FCC regs for the US.