Sect.
111
Page
8
of the sync pulse amplifier, V17, through an
RC
coupling which lowers the average voltage on the
grid to B-.
In
the absence of pulses, V17
is
biased
to cut-off by the bleeder to B+. When a positive
pulse appears at the grid, it momentarily turns
V17 "on", thus, inducing a large voltage swing in
the pulse transformer primary. The resistor and
diode in the secondary remove the positive excursion,
resulting in a negative pulse at the
SYNC OUT
ter-
minals.
3-7
POWER
SUPPLY
The Power Supply
is
a full wave rectifier and regula-
tor which supplies
+
375 volts. The
+
75 volt and
+
225
volt regulated outputs are taken from a voltagc
divider across the
+
375 volt supply. The main
requirement on the three regulated voltages
is
very
low impedance at low frequencies. Reasonable vari-
ations in the actual voltages do not affect the output
frequency or waveform.
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