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> Apex PA83 power op amp amplifier to-3-8
Apex PA83 power op amp amplifier to-3-8
PA83 Power Op Amp Amplifier TO-3-8
LOW BIAS CURRENT, LOW NOISE FET Input
FULLY PROTECTED INPUT Up to 150V
WIDE SUPPLY RANGE 15V to 150V
The PA83 is a high voltage operational amplifier designed for output voltage swings up to 145V with a dual ( ) supply or 290V with a single supply. Its input stage is protected against transient and steady state overvoltages up to and including the supply rails. High accuracy is achieved with a cascode input circuit configuration. All internal biasing is referenced to a zener diode fed by a FET constant current source. As a result, the PA83 features an unprecedented supply range and excellent supply rejection. The output stage is biased in the class A/B mode for linear operation. Internal phase compensation assures stability at all gain settings without need for external components. Fixed current limits protect these amplifiers against shorts to common at supply voltages up to 120V. For operation into inductive loads, two external flyback pulse protection diodes are recommended. However, a heatsink may be necessary to maintain the proper case temperature under normal operating conditions. This hybrid circuit utilizes beryllia (BeO) substrates, thick (cermet) film resistors, ceramic capacitors and silicon semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8-pin TO-3 package is hermetically sealed and electrically isolated. The use of compressible thermal isolation washers and/or improper mounting torque voids product warranty. Please see Application Note 1 General Operating Considerations .
I don't know the history on these, do not appear to ever have been installed, but, could be pulls
