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TYPE
1269-A
POWER
SUPPlY
PURPOSE.
The Type 1269-A Power Supply (Figure 1)
is
a general-purpose
source of plate and heater power for laboratory equipment and in parti-
cular for the General Radio Types 1208-C, 1209-C, 1209-CL, 1211-C;
1215-C, and 1361-A Oscillators, to which
it
attaches directly. Connec-
tion to other instruments requiring about 300 volts
de,
at 50 rna maximum
and 6.3 volts ac at 3 amperes maximum can be made by means of a
mating connector supplied
2 DESCRIPTION.
The Type 1269-A Power Supply
is
housed in a convertible-
bench cabinet. On the front panel are the on-off switch and the indi-
cator light. The output connector
is
on the right-hand side, the
input
power cord on the left-hand side.
3 OPERATING CHARACTERISTICS.
The Type 1269-A Power Supply provides about 300 volts de at
a maximum load of 50 milliamperes. With no load the output is about
405 volts de. A 6.3-volt 3-ampere ac heater supply
is
also provided.
If the ac load is limited to 1.5 amperes, as much ~s 65 milliamperes
can be drawn from the 300-volt supply (at about 285 volts). Ripple
is
less than 80 millivolts ac at full load.
Both the 6.3-volt ac and the 300-volt de supplies are isolated
from ground and from each other to permit greater latitude in external
connections.
4 INSTALLATION.
4.1 ELECTRICAL CONNECTIONS. Connect the Type 1269-A to an ac
line of 115 or 230 volts (as indicated on the left-hand side near the
power cord), 50 to
'
6 0 cps. The power supply will operate rf Unit Os-
cillators satisfactorily from a 400-cycle line, as well.
To give greater latitude in external connections, both the
6.3-volt and 300-volt supplies are isolated from ground.
4.2 BENCH MOUNTING. The Type 1269-A Power Supply can be rig-
idly attached to a Type 1208-C, 1209-C, 1209-CL, 1211-C,or 1215-Cby
means of the narrow adaptor plate and associated screws supplied with
the
_
power supply and the clip attached to the oscillator L bracket.
2
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