An automatic kinescope beam current limiter for a television receiver comprises a source of signal representative of kinescope beam current conduction, a first transistor responsive to the representative signal over first, second and third ranges of excessive beam currents above a threshold level, and...http://www.google.com.au/patents/US4253110?utm_source=gb-gplus-sharePatent US4253110 - Automatic kinescope beam current limiter with sequential control modes
