71a Single Ended Integrated Tube Amp February 8, 2014February 8, 2014 admin 71a Integrated Tube Amplifier – 417a Tube Driver + 71a Tube Amp – Separated 80 (83) tube rectifier + choke for driver and power stages – One Electron Output Transformers – Separated Power Transformers (Po-Shan) for driver and power stages