A fi lter com posed
of
ret<c;.rdation eoi l
L3B
and condenser C l5B i s connected
i n the positive lead of the 4,000-volt su pply. Another filter composed of retarda
tion coi l
Ll
9B and condenser C27 A is connected in the positive lead of the
2 ,000-volt supply. Both filter circuits i·educe the commutator ripple i n the plate
voltage su pply to th e vac u u m tubes.
Protection
I n 01·der to protect th e operator, sw itches D4B and D 5E are provided which
function to sh ut down the motor-generator sets whenever the rear door or front
wi ndow panel is opened.
M O D U L A T O R
G R I D C U R R E N T
F I L A M E N T
V O LTAG E
250
VOLT
G E N E R A T O R
F I E LD RHEOSTAT
A D J US T M E N T
4000
VOLT
T I M E D E L AY
R E L AY
P L A T E V O LT A G E
S W I T C H
P L A T E
OV E R L O A D
R E L AY
No.
D-87739 Amplifier Unit-Front View-Window Panel Closed
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