※Shipping service. Special Feature = Contemporary Noise Thoughts Vol.2/Overview of American 3-Pole Output Tubes/Mos-FET Single Stage OTL Amplifier/Medium Monitor Speaker Research/New Feedback Circuit Type DC Preamplifier/38 cmW Woofer System Vol.4/Published Circuit Diagram: PIONEER CT-580/S57.5.1 Issued Photographs are samples, so the actual product may be broken or written.