Stere Phono Pre-Amplifier (420-2111) Features Faxback Doc. # 6622 The Radio Shack Stereo Phono Pre-Amplifier lets you easily connect a turntable with a magnetic stereo phono cartridge to amplifiers without magnetic stereo phono cartridge capabilities. Its silicon transistors provide low noise and a stable RIAA compensated circuit. The pre-amplifier is housed in a small, sturdy, metal case and operates from a single 9-volt battery (Cat. No. 25-553). (CJD/all-08/17/94)