opening switch D21H and the 460-volt supply to the ampl ifier
units by opening circuit breake r CB64P in the Dis tribution
Cab inet . During 5-kw operation the re are no voltages within
the accessible enclosure exceeding the line vo ltage
(
460
volts 3-phas e a-c
)
, accidental contact with which is pre
vented by barriers . The power-distributi on cab inet DP50P,
voltage regulators T56P and T57P, and the water coo ling
system function the same as for 50-kw ope rati on.
SWITCH FUNCTIONS
DlA - "Os cillator Heater" - Dis conne ct switch in power
supply to the oscillator heaters . Leave in "ON"
pos ition.
D2A - "Power-Supply Circuit Breaker" - Circuit breaker
in power supply t o oscillator-ampl ifier . Leave
in 11 0N11 pos ition except when working in this
unit .
D3A - "Power'' - Disconnect switch to turn oscillator
amplifier 110N11 and "OFF" . Leave in 110N11 pos i
tion.
D4A - "Plate Rectifie r" - Controls high-voltage recti
fier in oscillator -amplifier unit . Leave in "ON"
pos ition and control this rectifier from D5F in
control unit .
D5A - "Os cillator" - This switch selects eithe r of the
os cillators provide d in the unit .
D6A - Link Switch in d-c plate supply of 3rd
RF .
ampli
fier . Leave clos ed except when neutralizing this
stage .
D7A - Link switch to remove plate vo ltage on 2nd audio
stage . Mechanically coupled to D6A.
D9A - Gate switches .
74
Содержание 407A-4
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