Television picture display device

摘要

In a class-B output amplifier having an npn-transistor the collector of which controls a cathode of a picture display tube via oppositely conducting parts of a diode and an emitter follower, respectively, a signal corresponding with the beam current through the relevant cathode is obtained from the collector circuit of an npn-transistor whose base-emitter path is arranged in parallel with the diode. The signal corresponding with the beam current can be used for controlling a background current and for limiting a beam current, respectively.