Driver Pwb - SAC SS-800AVS Manual

2.2.5 Driver PWB
Q1 and Q2 form a class AB push-pull driver for the final. The input
signal from Q3 on the Oscillator PWB is transformer coupled through
T1 to this stage and the output signal is coupled to the final stage
through T2o
Test point 4 (TP4, blue) is used to monitor the signal from the
preamp and the DC voltage on the preamp. This voltage is controlled
by the automatic shutdown circuit. Test point 2 (TP2, red) is used
to monitor the driver output as well as the DC supply voltage (50V).
Test point 3 (TP3, yellow) is used to monitor the input signal to
the final as well as the bias voltage on the final amplifier. The
black test point (TPI) is ground.
SS-800AVS
Southern Avionics
35
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