Series 6C1

6 TUBE AUTOMOBILE RADIO

Fig. 1 Various Control Head Mountings

Fig. 3 Antenna Plug Insertinn

Fig. 7 Speaker Connections at Terminal Strip

Fiq. 5 Location of Tubes and Vibrator

Set the signal generator for 175 KC and connect the output of the signal generator through a.05 mf. condenser to the stator of the R.F. interstage section of the tuning condenser. Set the volume control at maximum. The chassis should be in the case. Connect the ground lead of the signal generator to the chassis. Attenuate the signal from the signal generator to prevent the levelling off action of the AVC. Then adjust the three IP trimmers until maximum output is obtained.See Fig. 5.
Set the signal generator for 1581 KC Tum the rotor of the tuning condenser to the full open posi. tion. Insert the antenna plug with the mark on the high capacity (HC) side. Connect the shielded antenna lead from the chassis through a 120 mmf. con denser to the antenna post of the signal generator. Adjust the trimmer of the oscillator section of the three gang condenser until maximum output is ob. tained.
Set the signal generator for 1400 KC. Turn the rotor of the tuning condenses carefully until maxi. mum output is obtained. Adjust the R.F. interstage and antenna 1400 KC trimmers for maximum output. Do not change the setting of the oscillator trimmer.
Then set the signal generator for 600 KC. Tune in this signal and adjust the 600 KC antenna trimmer to maximum (See Fig. 3 for location of this trimmer).
After the alignment procedure is completed, the an. tenna plug may be withdrawn and reinserted on the LC side if a low capacity (70 mmf.) car antenna is used. Adjusting Antenna 600 KC Trimmer
Tune in a weak signal at approximately 600 KC with the volume control about three-fourths on. Turn the adjusting screw of the antenna 600 KC trimmer up or down until maximum output is obtained. See Fig. 3 for location of this trimmer.
If the total capacity of the antenna and shielded lead is approximately 200 mmf., which would be the case in a running board or ordinary roof antenna (not metal roof), insert the antenna plug with the mark on the HC side See Fig. 3.
If the total capacity of the antenna and shielded lead is approximately 70 mmf., such as may be the

Case if a " fish pole " antenna is used, insert the antenna plug with the mark on the LC side.
Distributor Suppressor Remove the high tension lead to the distributor. Insert a distributor suppressor and connect the wire to the other end of the sup. pressor (See Fig. 6). If this is not practical, cut the high tension lead close to the distributor and use a wood screw end type distributor suppressor in this line.
Generator Condenser The generator condenser is installed at the cut-out as shown in Fig. 6. The lead from the condenser goes to the terminal on the cut. out.
In some of the new cars the cut-out relay is on the front of the dash or in some other location. It will be most convenient to mount this generator con denser at the relay. Withdraw Antenna Cable Plug
Turn on the radio and start the engine. If motor noise is heard, proceed as follows:
Shielding High Tension Lead - In some cars, when the coil is mounted on the dash, the high tension lead from the coil must be covered with braided shielding to within about four inches of the distributor and the shield grounded to the motor block or frame.
Bypass Condenser - Try a.25 or, 5 mfd. con denser from the ammeter to ground. Try a condenser from the car fuse to ground, switch to ground, wind shield wiper connections and various other 6 volt connections to ground, noting what effect these condensers have on the noise pick-up.
Try a.25 or 5 mfd. condenser from the " Hor " side of the coil primary to ground. In some cases this condenser may not help. It can be tried out, however, experimentally.
Spark Plug Suppressors If motor noise persists, spark plug suppressors must be installed. One suppressor is put on each plug as shown in Fig. 6. These are not regularly supplied with the radio and must be purchased extra. Seventy percent of all cars will not require spark plug suppressors.
Care should be taken that a good mechanical and electrical connection is made between the spark plugs, suppressors and plug wires.