The Model 1200A Stereo Test Panel provides three basic functions: a. Convenient switching to eliminate cumbersome and repetitious cabling requirements. b. Test signal conditioning to simplify dual-channel measurements, including a precise inverse-RIAA function to allow accurate and convenient measurements of phono preamplifiers. c. Measurement pass-band filtering, in accordance with ANSI and IEEE-IHF specifications. 2-3. Other significant features include test speaker protection, hot chassis protection, external probe connectors for both an oscilloscope and a Sound Technology Model 1700A/B Distortion Analyzer, sweep width control for S-T Model 1000A Dual-Sweep operation, and precise FM modulation signals.