Patent attributes
Audio input tubes and power output tubes in a vacuum tube amplifier are powered and controlled by solid state controllers. The solid state controllers sample incoming audio and anticipate and apply changes and biases in grid and plate voltages before the audio signals arrive in the power output tubes. Any mains voltage is filtered, regulated and converted to a standard voltage which is converted to plural DC voltages that are applied to sensors, tube cathode heaters, grids and plates and are varied on screen grids and plates with stepped increases and autobias. The solid state components have sensors and feedback to control voltages. Sensed overvoltages fold back power to the solid state devices and heaters, screens and plates to provide uninterrupted amplification without endangering the tubes or components.
