K155 Stereo Tone Control Unit

General-purpose stereo preamplifier based on the venerable MC4558. -2dB Gain. +/-12dB bass & treble boost/cut, channel balance control. 0.8% THD, -3dB flat from <20Hz to >50kHz. S/N 85dB. Requires +6Vdc to +15Vdc supply (not included). 10mA supply current.