The Audio Voice Newsletter Sign up « BackShare tube amplifiers constant current Bill Reeve May 2014 tube heaters warm-up Show more (6) Show less by Bill Reeve on Theory Articles Article « BackShare related items audioXpress May 2021 Celebrates Its Glass Audio and Audio Electronics Roots Read more... Practical Test & Measurement Testing Power Amplifiers Read more... Audio Electronics: Myths in Tube Circuit Designs Read more... It's Tube Time! audioXpress May 2022 Glass Audio Special! Read more...