※Shipping service. Special Feature = Modern Noise Considerations Vol.2/Summary of American 3-pole Output Tubes/MOS-FET Single Stage OTL Amplifier/Medium Monitor Speaker Research/New Feedback Circuit Type DC Preamp/38cmW Woofer System Vol.4/Published Circuit Diagram: PIONEER CT-580/S57.5.1 Published circuit diagram: PIONEER CT-580/S57.5.1 issue photos are samples, so the actual product may be broken or written on it.