UNITED MOTORS SERVICE D IV ISIO N OF GENERAL M O TO RS C O R P O R A T IO N. General Offices - Detroit AUTO RADIO BULLETIN

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1 UNITED MOTORS SERVICE D IV ISIO N OF GENERAL M O TO RS C O R P O R A T IO N General Offices - Detroit AUTO RADIO BULLETIN Page 1 FIRST ISSUE SUBJECT: SERVICE INSTRUCTIONS - CHEVROLET TRUCK MODEL GENERAL MOUNTING All 1955 Chevrolet Trucks. TUBES Five, plus rectifier. SPEAKER 5"x7" Elliptical, Permanent Magnet. TUNING Manual. ANTENNA TRIMMER COMPENSA TION For Antennas Between Mfd. TUNING RANGE KC. ALIGNMENT PROCEDURE A Lead Dial Light Lead Output Meter Connections Across Voice Coil Generator Return To Receiver Chassis Tone Control Volume Control and Switch Dummy Manual Tuning Control Dummy Antenna In Series With Generator Volume Control Position Maximum Volume Tone Control Position Treble Generator Output Minimum for Readable Indication Steps Series Capacitor or Dummy Antenna Connect Signal Generator to Signal Generator Frequency Tune Receiver to Adjust in Sequence For Max. Output Mfd. 12BE6 Grid (Pin # 7 ) 262 KC High Frequency Stop A, B, C, D Mfd. Antenna Connector 1615 KC High Frequency Stop *E, F, G Mfd. Antenna Connector 1000 KC Signal General Signal J, K Mfd. Antenna Connector 1615 KC High Frequency Stop F, G Mfd. Antenna Connector 900 KC Signal General Signal ** * Before making this adjustment check mechanical setting of oscillator core H. The rear of the core should be 1-25/32" from the mounting end of the coil form. (This measurement is readily made by inserting a suitable plug in the mounting end of the coil form.) Core adjustment should be made with an insulated screw driver. **Tune in 900 KC signal and adjust pointer on the dial cord so that the pointer is on the 900 KC mark of the dial. This setting is to give the correct relationship between the pointer and dial when the radio is installed in a car. With the radio installed and the car antenna plugged in adjust the antenna trimmer G for maximum volume with the radio tuned to a weak station between 600 and 1000 KC (see sticker on case.) 6 GO, 6 WD, 6ESD, 131, 132:15 PRINTED IN U. S. A.

2 Date Page PARTS LAYOUT TUBE VIEW PARTS LAYOUT CHASSIS VIEW

3 CH EVRO LET A L L V O LTA G E S M E A S U R E D T E R M IN A L TO C H A S S IS W IT H VAC U U M T U B E V O L T M E T E R. - NO S IG N A L A N D V. A T IL L U S T O TA L "A " DRAIN 2.5 AM PS. TO TAL " B " DRAIN 5 0 MA. TO LERANCE ON VOLTAGES ± 1 0 %. * * - S E E S E R V IC E P AR TS L IS T F O R R E P L A C E M E N T. -O S C IL L A T O R G R ID VO LTA G E A T KC. * -C O L O R S O F T E R M IN A L S O N S E R V IC E PAR TS. - I N D I C A T E S L E A D S F R O M C O IL A S S E M B L Y. K - I N D IC A T E S T H O U S A N D FO R RESISTO R V A L U E S. Bulletin Chevrolet Date Page GD

4 Page 4 TUNER NOTE: ESCUTCHEON CROSS SECTION FOR COMPLETE SERVICE INFORMATION ON THE PUSH-PULL LOCK-UP TUNER SEE BU LLETIN 6D -619 PRINTED IN U. S. A.

5 Page 5 SERVICE PARTS LIST Chevrolet Truck Model Illus. No. Service Part No. Description ELECTRICA L PARTS Coils Antenna Antenna Series Choke 3 Antenna Spark Choke RF *5 * Oscillator st IF i nd IF Hash choke Capacitor Antenna trimmer capacitor mfd 400 V. tubular ( ) mfd 200 V. tubular ( ) Dual capacitor Mfd. 14 A mfd disc ceramic mfd disc ceramic Dual trimmer 15 A R F section 15B Osc. section mfd compensating *17 * mfd 500 V. disc ceramic Electrolytic ( ) 18A 20 mfd 400 V. 18B 20 mfd 400 V. *19 * mfd 600 V. tubular ( ) *20 * mfd 600 V. disc ceramic 21 H mfd 800 V. tubular ( ) *22 * mfd, disc ceramic Spark plate assembly 23A Dial light section 23B A lead section Chassis plate capacitor *27 *H mfd 1600 V, tubular ( ) Resistors ohms ½ W megohms ½ W ,000 ohms 2 W. *34 * ,000 ohms 1 W ,000 ohms ½ W ,000 ohms ½ W ohms ½ W megohm ½ W ,000 ohms ½ W ,000 ohms ½ W meg ½ W ,000 ohms ½ W ohms 1 W. *44 * K ohms 1 W. (Carbon rod type) ohms 2 W. wire wound (Replace with 1171 } 2700 ohms 2 W. and 5600 ohms 1 W. in parallel) *46 * ohms 1 W. 12BA6 12BE6 12AV6 12V6GT 0Z4 Tubes 12BA6 12BE6 12AV6 12V6GT 0Z4 Number stamped on part but not same as Service Part No. * Part first used in PRINTED IN U. S. A.

6 Bulletin 6D -858 Page 6 SERVICE PARTS LIST Chevrolet Truck Model (con t.) Illus. No. Service Part No. Description MISCELLANEOUS *51 * Control, volume, tone and switch 51A Tone control 51B Volume control 51C Switch *52 Lamp, dial #57X Speaker, 5" x 7" ( ) Transformer, output Transformer, power Vibrator ( ) MECHANICAL PARTS Socket, antenna 6072 Socket, 7 pin miniature 6070 Socket, octal tube 6074 Socket, vibrator Socket, dial light Number stamped on part but not same as Service Part No. * Part first used in Tuner Tuning shaft assy Spring, washer 6277 C washer Bushing, manual drive shaft Core bar assembly Core, iron tuning Escutcheon assy. 81 Dial glass (part of escutcheon assy.) Pointer assy Spring, dial cord drive Spring, manual drive Cord, dial Pulley, dial cord drive INSTALLATION PARTS 6030 Capacitor, (.5 mfd.) generator ( ) 6089 Capacitor, (.5 mfd.) ignition coil ( ) 6030 Capacitor, (.5 mfd.) voltage regulator ( ) Fuse Knob assembly, control Knob, dummy Knob, tone control Radio support bracket 6009 Collector, static * Speaker housing

UNITED MOTORS SERVICE D IV ISIO N OF GENERAL M O TO RS C O R P O R A T IO N. General Offices - Detroit AUTO RADIO BULLETIN

UNITED MOTORS SERVICE D IV ISIO N OF GENERAL M O TO RS C O R P O R A T IO N General Offices - Detroit AUTO RADIO BULLETIN Bulletin 6D-855 Date 11-1-54 Page 1 FIRST ISSUE SUBJECT: SERVICE INSTRUCTIONS -