Abstract: A biasing system for use with a multi-stage depressed collector of a high power amplifier includes one or more adjustable power sources. A power controller provides control signals to the power sources depending on the operational RF power level. For low power applications, biasing of collector electrodes is reduced such that savings in energy costs are realized, and operational temperature and wear are reduced. The control signals are based on values stored in a look-up table. For multiple depressed electrodes, biasing can be controlled in tandem or independently.

Abstract: The drawbar device of this invention illustrates two structures, both substantially similar, and providing a beam member that is removably mounted in a slide guide and retaining bracket. This device may use an I-beam or a tubular steel member. Each beam is provided with divergent arms, with ear portions adapted to be secured, as by pins, to a retainer plate secured to the frame of a dump truck. A front plate on the beam has an adjustably-secured trailer hitch hook by which a trailer may be attached for towing. The retaining bracket is also fixedly secured to the frame of the dump truck.