voltage at the + 200-volt line. A rise in tile
52. Power Supply V12, V13, V14, and V15, and Filter
voltage at the +200-volt line increases the
Assembly
voltage drop along the bleeder network
a. Power Supply. The power supply (fig. 18)
consisting of R103, R104, and R105. The
furnishes a regulated 150 volts de to VS, V10, V16, and
increased voltage drop across :R105
V17, and a regulated 200 volts dc to the remaining
increases the positive cathode bias of V14B,
stages. Power for the indicator lamps and tube heaters,
thereby reducing its plate current.
The
with the exception of the heaters in the surge and rectifier
reduction in the plate current of V14B results
circuits, is furnished from terminals 8 and 9 of power
in a reduction in the voltage across plate
transformer T1. The voltage across terminals 10 and 11
resistor R106, which is also part of the grid
furnishes tube heater power for the surge circuit. The
return of V14A. A rise in the positive voltage
rectifier heater is supplied by terminals 6 and 7.
at the plate V14B reduces the negative bias
(1) Power from a 115-volt, 50- to 60-cps source
on the grid of V14A and increases plate
is fed through power plug P1 and cable W1
current flow through it with a consequent
to the primary winding of power transformer
increase in the voltage drop across plate
T1, through 1.5-ampere fuses F1 and F2,
resistor R96. An increase in voltage across
and POWER switch S4. Switch S4 is a
R96 increases the negative bias on the
three-position switch which connects the
control grids of V12 and increases the plate
primary winding of T1 to 115 volts
resistance of V12. The increased plate
alternating current in the ON and STANDBY
resistance increases the voltage drop across
positions and disconnects the primary in the
V12, and maintains the voltage at the +200-
OFF position. The 700-volt center-tapped
volt bus practically constant. A decrease in
secondary winding of T1 supplies plate
voltage at the + 200-volt line reduces the
voltage to full-wave rectifier V15.
The
voltage drop across V12. Resistor R91
center tap of the winding is connected to
introduces a small out-of-phase ripple
ground through POWER switch S4 when the
component to improve filtering efficiency.
switch is in the ON position, and is
Potentiometer R105 (+200 adjust) is
disconnected in the STANDBY and OFF
adjusted to provide a 200-volt output at the
positions. With switch S4 in the ON position,
200-volt bus Voltage regulator V13 in series
the rectifier and filter develop a positive 400-
with 997 and R98 is connected between the
volt do output. The filter is composed of
200-volt bus and ground. The firing potential
C85, R90, and C84. Resistors R110 and
of. voltage regulator OA2 is 150 volts which
R111 form a bleeder circuit across the input
appears between pin 5, the anode of the
of the filter.
OA2 and ground. Any change in voltage or
(2) The dc output voltage of the rectifier circuit
current will cause the resistance of the
is regulated by V12, V13, and V14.
voltage regulator tube to change, thereby
Regulator tube V12 acts as the variable
maintaining a 150-volt output. Resistors
control-resistance between the resistance-
R97 and R98 are current limiting resistors,
capacitance output filter and the +200-volt
R99 and R102 form a voltage divider, and
bus. The bias of V12 is controlled by the
C82 decouples the voltage regulator from
plate current of V14A. The bias of V14A is
the grid of V16.
dependent on the plate current of V14B.
Control amplifier V14B is biased by the
voltage drop across R102 which is stabilized assembly contains three double pi inductance-
by glow discharge tube V13, but the cathode capacitance sections that decouple the various stages of
bias of V14B is dependent upon the actual the generator from the power supply and
34
