http://www.marenius.se/indexeng.htm Based on high quality transformers, quad matched transistors and low noise OP-amps the SMF-5 is considered to be one of or actually the most low noise mic amps available.
SMF-5 has two identical channels. Each having a balanced XLR input with 48 V phantom power available. Gain is individually adjustable within 30 ... 70 dB. Outputs are balanced (XLR) and unbalanced (RCA) line level signals. SMF-5 may be driven from the A.C. mains adaptor, included, or 2 X 9 V alkaline batteries.
Note: performance spec. @ mains power supply.
Frequency Response 10 Hz - 25 kHz -3dB
Equiv. input noise level -128 dBu
T H D <0,01 %
Max. gain 70 dB
Min. Gain 30 dB
Phantom power voltage 48 V
Input impedance 1 K ohms
Output impedance 2 x 22 ohms
Max. input signal level -6 dBu
Max. output signal level: +24 dBu
Output sockets XLR balanced
RCA unbalanced
Input sockets XLR balanced
Power supply A.C. supply 5 VA @ 230 V AC
2 X 9 V alkaline batteriesSize WxHxD 140 x 58 x 140 mm
Weight 1 kg
price...645.00
there is also
www.fmraudio.comor
http://www.davisound.com/ who will build a DC model for you if you ask....