coil of S2B i s connected i n the negative lead of the h igh voltag·e generators
a n d
its contacts control the operation of relay S4B. Whenever excessi\·e cu rrent
flows in the h igh voltage circuit, relay S2B trips, thereby de-energ i z i ng
s
.
1
B .
The contacts o f S4B open the field c i rcuit o f the h igh voltage generators, thus
removing the high voltage. It i s necessary to reset relay S2B by hand once th e
contacts have been tri p ped.
Additional protecti on is afforded th e vacuum tube circuits by fuses mounted
in the rear of the Ampli fier Unit. The code numbers and rati ngs of the fu$es
are l i sted i n the section on Apparatu s Information.
ANTE N NA
C I R C U IT
CO U P L I N G
C O N D E NSERS
F I LT E R
R 4 B
G R I D B IAS
e
R E S ISTA N C E
COU N T E RP O I S E
- B US H I N G
POW E R A M P L I F I E R
P L AT E CHOKE
C O I L
POW E R A M P L I F I E R
P L A T E STOPP I N G
C O N D E N S E R
S P E EC H A M P L I F I E R
G R I D B Y - PASS
CON D E N S E R S
POW E R A M P L I F I E R
DI B
F I L A M E N T R E V E R S I N G
S W I T C H
G R I D B I A S
POT E N T I O M E T E R
R E S I S TA N C ES
No. D-87739
A mplifier U nit-Rig ht Side View
[ 31 ]
