i J - PULSED OPERATION OF A HIGH - POWER AMPLIFIER WITH COMPLEX LOAD IMPEDANCE

In several reports issued previously, a theoretical analysis has been given for the steady-state operation of a vacuum-tube power amplifier with a complex load impedance* This theoretical work was checked experimentally with amplifiers operating in the steady state at low power levels. One application of an amplifier which sometimes must operate with a complex load impedance is in naval sonar equipment* Such a sonar amplifier produces short pulses of high-frequency energy at power levels that are quite high. In the accompanying report is given a description of tests mado using the amplifier from a Type XQHB sonar system. Experimental measurements were made on the amplifier and compared with characteristics of the operation predicted from the theoretical analysis. Agreement between experiment and prediction is moderately good. Reasons for disagreement Include the difficulty of experimental measurement with pulsed operation, and the fact that the assumptions used in the theory are satisfied only reasonably well by the amplifier. 1