Valve (2 x 12AT7). Three (3) Line Inputs. Alps Volume Control. Matched Input Tubes. High Grade Selection Relays. Three (3) Independent DC Power Supplies. Double Face Printing Circuit with Separete Signal & Power Path. Power Supply Capacitors United Chemicon. Porcelain Tube Bases. Hand Made Power Transformer. High Grade Polypropylene Signal Capacitors. Metal Film Resistors with Low Tolerance 1%. Gold Plated Input Connectors Ultimax. Gold Plated Output Connectors Ultimax.