Audiola Radio Co. 347 Schematic

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Manufacturer:Audiola Radio Co. (Fairbanks-Morse)

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Page 1:




lSeven Tune Auto Radio

This receiver is a seven tube superheterodyne using the
most modern circuit design and tubes. Tubes used are:
one 6D6 R.F. Amplifier; one 6A7 combination lst detector
and oscilator; one 6D6 I.F. Amplifier; an 85 diode
detector with delayed A.V.C. and one stage audio; two 41
power output tubes and one 84 rectifier tube.

In the installation of this receiver there are a few im-
portant fundamental principles to adhere to:

(l) Avoid having any battery wires in close relation to
the high voltage spark coil or plug wires.

(2) The antenna must be routed over the most quiet loca-
tion. Interference will often go through the antenna
shielding if touching brake, accelerator, or steering
column rods. The lead in must be shielded up to the an-
tenna and the shield bonded to the set chassis. In many
installations the antenna shield must also be bonded to
the chassis of the car where the shield turns up to the

(5) If the chassis has to be removed from housing, be
certain to tighten the three screws on the bottom when re-
placing the chassis.

(4) After installation is completed, adjust antenna trim-
mer on some distant station around 1400 to 1500 K.C. turn
in either direction for loudest signal. The antenna triue

mer is directly under the serial number on the tcp of the
set. The front cover screws must always be tight.

(5) The gang condenser control (tuning) must run very
freely and have not'leas than 1/52 of an inch end play.

606 snr one 55 a

MODEL 34 7 A934

AudiolA is Brst to develop an auto radio that eliminates mnmr noise without the use of spark
plug snppresaors. '

This is an important engintering advent-einem in the autn radio art. We are pleased to have
made this contribution to llle radio industry.

ll. is important that you understand this new pioneering development.

We have successfully installed the AudiolA auto radio without spark plug suppressors, and
eliminated all motor noise and other noise, from every car that we have tried. This has covered almost
every make and model nf automobile.

For Elimination of Interference data, see Model 546.

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