Special Feature = Mid Bass Research/Vacuum Tube Amplifier/European 3-Pole Output Tube/KT-66, 50 Power Amplifiers/Internal and External Tweeter Research Vol.3/PP Shunt Power Preamp/Importance of Midbass Vol.2/Frontier Technology “Hybrid Circuits” /Published Circuit Diagram: MARANTZ SC-11/S60.1.1 Published. The photograph is a sample, so the actual product may be broken, or there may be markings etc.