SW1X Audio Design™ MPA V Hercules Performance Level 3/4/5 300B DHT Valve Mono Power Amplifier   Hercules is a Pure Class A, Zero Negative Feedback, Directly Heated Triode, Fully Valve Rectified, Single Ended, 3 Gain Stage, Interstage Transformer coupled, Mono Power Amplifier. The 300B Triodes in combination with 6V6 triode connected driver tubes offer the … Continue reading SW1X MPA V “Hercules” Mono Power Amplifier