Echophone Radio Corp. 139C Schematic

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Product Information:
Model:139C
Manufacturer:Echophone Radio Corp. (Hallicrafters)

Schematics Content:

Please note: this content is a computer-generated interpretation of the above schematic and is provided only to help assist you in locating this schematic. For the actual text, please consult the schematic above. Thank you.

Page 1:

ECHO- PAGE 6-1

ECHOPHONE RADIO MFG. Co. Smmimswket
Trimmers

Power

BAND anumZ

(C)J0hn F. Rider, Publisher

Page 2:

PAGE A6_2 ECHO.

Alignment

To align receiver, proceed as follows:

SERVI CE MANUAL
MODELS #159 ~ #139C

This receiver is a six tube superheterodyne, designed to
operate on 105 to 120 volts alternating current, 60 cycle
and can also be furnished for 25 cycle.

Tube complements

6A7 - first detector and oscillator
6D6 _ I F amplifier

75 - second detector-AVC- lst audio
42 - in parallel - power output
80 - rectifier

This receiver covers the following three wave bands:

- 1720 kilocycles

1720- 5000 kilocycles

megacycles

Very satisfactory results should be obtained with an an-
tenna of from 40 to 75 feet long, well insulated and erected
well up above ground and at least ten feet away from surround-

Apply 456 KC note to control grid of 6A? and peak I
I F transformers for maximum gain.

Apply 4000 KC note to antenna wire; set band switch
to second band and align trimmer on oscillator sec-
tion of variable condenser to track with 4000 KC

Turn band switch to broadcast band; apply 1500 KC
note to antenna wire, adjust trimmer on RF section
of variable condenser for maximum gain. '
Apply 600 K0 note to antenna, adjust padder conden- \ i
ser for maximum gain, swinging condenser back and
forth across 600 KC signal.

Check 1400 K0 signal for alignment.

Turn band switch to second band; check 4000 KC signal
for alignment and adjust trimmer on antenna coil for
greatest gain at 4000 KC.

Turn band switch to last band and adjust trinmer on
antenna coil for greatest noise on 12 megacycles.

CUohn F. Rider, Publisher

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