This is the 500 series of the well-known microphone preamplifier, the FORSSELL SMP-2
Specifications
Minimum Gain = +6 dB
Maximum Gain = +68 dB or +74 dB (optional)
Input Impedance = 13k ohms
EIN (Max gain) = better than –128 dBu (22 Hz to 22 KHz, unweighted), typically –130 dBu
CMRR (measured at +45 dB gain) = better than 90 dB
Frequency Response = 5 Hz to 100 Khz +0, -0.5 dB
THD +N = better than .005%
Maximum Output Level >= +27 dBu
Recommended Load Impedance >= 600 ohms
Preamp Output Impedance = 10 ohms
Power consumption = appox 13 watts
