Low frequency class D vacuum tube amplifier has multivibrator that varies clock output pulse duty cycle according to control voltage so pulse time-voltage area difference varies with input signal

摘要

The vacuum tube amplifier is operated in a pulsed manner and is followed by a low pass filter. A multivibrator used to generate the pulses varies the duty cycle of the output pulses of a clock according to a control voltage so tat the difference in the time-voltage area of two immediately successive pulses of a clock is proportional to the input signal level.