RIAA stereo pre-amplifier for MD pick-ups. Has low noise.
Specifications:

1. supply voltage: 10 -30VDC / 5mA regulated
2. gain (1kHz): 35dB
3. input signal: 5 - 10mV
4. input impedance: 47Kohm
5. PCB dimensions: 44 x 65mm / 1.7 x 2.6"

usermanual_k2573.pdf

resistor_colour_code.pdf

module_diy_kit_guide.pdf