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VI
INSTALLA TION
Power Supply - The power supply circuit
is
in'
tegral with the receiver. Determine line voltage and
frequency and check with the rating of the receiver.
The power transformer primary may
be
connected
for anyone of five voltage r3:nges by means of a tap
switch. This switch is located in the rear apron of the
receiver. and the voltage for which
it
is set may be
read directly on the switch.
For Battery or other Supply Operation - For con'
nections see Schematic Diagram Figure 11. It is only
necessary to remove the plug from the socket on the
rear of the receiver, and connect the batteries
to
the
proper terminals as indicated by the schematic dia'
gram. A battery cable terminating' in an octal male
plug is necessary for this purpose. A vibrator power
supply MI,8319 is available which will operate the
receiver directly from a 6 volt storage battery. For
information on this power unit see Section XI.
Tubes - Inspect the chassis before applying power
to see that all tubes are firmly seated in their respec'
tive sockets.
Antenna - The input impedance at the antenna
terminals is designed to match a 200 ohm transmis'
sion line except on the broadcast band where a low
frequency primary is used.
For general use it is recommended that a straight
wire antenna between 25 and
m
feet long be used.
Speaker
Terminals for connection of a loud,
speaker are indicated in Figures 3 and 6. The output
transformer is designed to match a speaker having
2.25 ohms impedance.
Headphones - A jack is provided on the left of
the front panel for plugging in a pair of headphones.
There are two positions of the plug.
1.
Half way in-for reception on both speaker
and phones.
2. Fully. in-=-for phone receptiori only.
See "CIRCUIT ARRANGEMENT" "Output
Tube."
Mounting - The instrument may be placed on a
table or mounted on a rack. ror rack mounting loosen
the panel mounting screws and remove the front
panel and chassis complete from the cabinet. Then
mount on rack by means of the slots at the sideS of
the panel.
VII
OPERATION
Figure
4
illustrates the three dials and eleven con trol knobs.
TUN'NG
VERNIER
TUNING METER
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3
OFF •
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TUNING
M.GAIN
AUDIO GAtM
SELECTIYITY
Figure 4-Diagram of Front Panel
8
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