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Delco Manuals: Radio Model 633, Delcotron Generator




This model of the Delco Radio is a six-tube super-heterodyne[1] receiver designed for operation with a HEADER type speaker. It comprises the best in automotive radio engineering, featuring Syncro-Tuning—the newest, most efficient antenna circuit yet developed, and Sensitivity Control.

The speaker and remote control unit are supplied in separate packages and are available in a wide variety of types and styles, depending upon the make and model of car the unit is to be used on.

The package contains:

Part No.
1 Receiver Unit, complete with tubes
1 Speaker Unit (less Adapter) 1210934
1 Combined Drilling Template and Radio—Dash Spacer
2 Chassis Mounting studs, ¼—20 x 2½ 1207562
2 Chassis Mounting Shakeproof Washers 1208565
2 Chassis Mounting Nuts, ¼—20 120375
1 Antenna Lead 1209622
1 Distributor Suppressor 1207818
1 Generator Condenser 1849014
1 Ammeter Condenser 1209333



See Instructions in antenna package.[2]


This receiver may be installed on any car with Positive or Negative ground without any changes of wiring.

When possible, locate the chassis on the driver's side of the dash, over the steering column, with the removable cover plate facing the floor. This position places the control shafts on the end of the case facing the center of the car.

Locate the position of the mounting holes by means of the template included in the package. Drill the holes, using a 3/8" drill, and scrape the paint from around the holes on the engine side of the dash to insure a good ground connection as there is no other ground connection for this receiver.

Make sure that all tubes and the vibrator are pushed well down in their sockets and that all the grid clips are properly in place on the top caps of their respective tubes.

If a six-volt storage battery is available, check the receiver for normal operation before permanently installing it on the car. The antenna lead and control unit may be temporarily connected for this test.

Insert the two receiver mounting studs in the back of the receiver case with the "burred" threads nearest the receiver to make sure that these studs do not enter the case far enough to cause damage to the receiver parts.[3]

Install the receiver, using the drilling template as a spacer between the dash and the receiver case. Install the two shakeproof washers over the chassis mounting studs. Then tighten the mounting nuts to insure that the receiver case shall be thoroughly grounded to the dash.

Antenna Lead—

Attach the black antenna lead to the car antenna and plug the connector on the antenna lead into the receiver chassis as shown in the Installation Diagrams. Ground the pigtail of the antenna lead shield to a convenient body bolt. Keep antenna lead out of engine compartment to avoid possibility of ignition interference being picked up by the lead-in.


See Instructions in speaker package.

Remote Control Unit—

See Instructions in remote control package.


The volume control and station selector shafts are AUTOMATICALLY adjusted as follows:

1. Insert control cables in their respective bushings on the case (volume control is upper bushing when receiver is installed in the car), until they seat themselves and then tighten the set screws.

2. Turn the station selector knob to the right (clockwise) until it stops—then turn the knob counter-clockwise until it stops. The dial is now logged.

3. Turn the volume control knob clockwise until the knob turns hard. The volume control is now on full.[4]

Eliminating Motor Interference—

Connect the ammeter condenser to the spring clip at the end of the wire containing the fuse holder by means of the self-threading screw on the side of the spring clip. Ground the other terminal of the condenser at any convenient point.

Install the generator condenser on the generator side of the generator cut-out as shown in the Diagram of Connections. DO NOT connect the flexible lead to the field terminal of the generator.

Remove the center distributor lead and insert the distributor suppressor in its place. Then plug the distributor lead into the suppressor.

Adjusting Delco Syncro-Tuning—

Turn the receiver on.

Tune-in a radio station which logs between 55 and 65 on the dial and gives the radio a signal BARELY AUDIBLE in the speaker WITH the VOLUME control FULL ON. A small snap button cap is located in the end of the receiver case beside the antenna lead connection. Remove the snap button cap by prying with a small screw driver.

By means of a small screw driver inserted in the hole which was covered by the small cap, adjust the Delco Syncro-Tuning condenser unit for maximum output in the speaker. Remaining on same station, readjust station selector for maximum volume and readjust the Delco Syncro-Tuning Condenser unit for maximum output. No further adjustment of this unit will be necessary as the receiver is now adjusted for best operation with your car antenna. Replace the snap button cap.[5]


To Turn On Receiver—

Some control units have a small knob located below the center of the dial. If your receiver is equipped with this type of control push this small knob in as far as it will go. Other control units have a combination on-off switch and volume control knob. To turn on this type of control turn the knob clockwise until the switch clicks and the dial is illuminated.

Volume Control—

Turning the volume control knob toward the right increases the output of the receiver and turning it toward the left reduces the output.

How To Tune The Receiver—

Turn the volume control knob approximately half way to the right. Rotate the station selector knob slowly until a station is heard. Tune this station in until the minimum amount of background noise is heard. Increase or decrease the volume to the desired level by adjusting the volume control knob. Careful tuning will result in better tone quality from all stations.

If the program being received is from a powerful local station local interference may be practically eliminated by turning the sensitivity control to the LOCAL position. You then will get the best possible reproduction of that station's program.

Sensitivity Control—

The sensitivity control is located on the lower, left front corner of the receiver case and when turned to the LOCAL position it decreases the sensitivity of the receiver sufficiently to greatly reduce interference from street cars, electric signs, X-Ray machines, electrical machinery, power lines, etc. It will also eliminate interference from weak stations.

When the control is turned to the DISTANCE position the receiver is allowed to operate at maximum sensitivity.

Tone Control—

The tone control is located on the lower, right front corner of the receiver case. This control is to be adjusted at the operator's will. However, most experienced operators prefer to set it for maximum treble response when the car is operated at high speeds.

To Turn Off The Receiver—

If the control head has a key knob in the center pull the knob out until it clicks into the off position and the receiver ceases to operate. If you wish to lock the receiver, pull the knob all the way out of the control unit and carry it with you.

If you are using the type of control unit which has a combination on-off switch and volume control knob turn the knob to the left until the receiver ceases to operate.[8]


Should your receiver fail to operate, first check the fuse located in the fuse holder in the ammeter cable. If you wish to remove your tubes and vibrator for test purposes, their location is indicated below.

Tube Complement

2 Type 6D6
1 Type 6A7
1 Type 6B7
1 Type 6B5
1 Type 84

Any further service work on your receiver should be referred to a competent radio service station.[9]

When at home call your local




DATE RADIO INSTALLED..................................

Principal Broadcast Stations[A]


Abilene, Kans.
KFBI 1050
Albuquerque, N. M.
KOB 1180
Alexandria, Va.
WJSV 1460
Amarillo, Tex.
KGRS 1410
WDAG 1410
Ames, Iowa
WOI 640
Asheville, N. C.
WWNC 570
Atlanta, Ga.
WSB 740
Atlantic City, N. J.
WPG 1100
Baltimore, Md.
WBAL 1060
Belle Plaine (Moose Jaw), Sask.
CJRM 540
Billings, Mont.
KGHL 950
Birmingham, Ala.
WAPI 1140
Bismarck, N. D.
KFYR 550
Boise, Idaho
KIDO 1350
Boston, Mass.
WBZ 990
WBZA 990
WEEI 590
WHDH 830
WNAC 1230
Brookings, S. D.
KFDY 550
Brooklyn, N. Y.
WBBR 1300
Buffalo, N. Y.
WBEN 900
WGR 550
WKWB 1480
Chattanooga, Tenn.
WDOD 1280
Chicago, Ill.
WBBM 770
WCFL 970
WENR 870
WGN 720
WJJD 1130
WLS 870
WMAQ 670
WMBI 1080
KYW 1020
Charlotte, N. C.
WBT 1080
Cincinnati, Ohio
WLW 700
Clay Center, Nebr.
KMMJ 740
Cleveland, Ohio
WHK 1390
WTAM 1070
Colorado Springs, Col.
KVOR 1270
Council Bluffs, Ia.
KOIL 1260
Covington, Ky.
WCKY 1490
Dallas, Tex.
KRLD 1040
WFAA 800
Denver, Colo.
KLZ 560
KOA 830
Des Moines, Ia.
WOC 1000
Detroit, Mich.
WWJ 920
WJR 750
WXYZ 1240
Eau Claire, Wis.
WTAQ 1330
Edmonton, Alta.
CJCA 730
Elmira, N. Y.
WESG 1040
Fargo, N. D.
WDAY 940
Fayetteville, Ark.
KUOA 1260
Fort Wayne, Ind.
WOWO 1160
Fort Worth, Tex.
KTAT 1240
WBAP 800
Gainesville, Fla.
WRUF 830
Gary, Ind.
WIND 560
Great Falls, Mont.
KFBB 1280
Harrisburg, Pa.
WBAK 1430
Hartford, Conn.
WDRC 1330
WTIC 1060
Havana, Cuba
CMCQ 780
CMK 730
CMW 590
CMX 890
Hollywood, Cal.
KFWB 950
Honolulu, Hawaii
KGU 750
Hot Springs National Park, Ark.
KTHS 1040
Houston, Tex.
KPRC 920
Indianapolis, Ind.
WFBM 1230
Jackson, Miss.
WJDX 1270
Jacksonville, Fla.
WJAX 900
Kalamazoo, Mich.
WKZO 590
Kansas City, Mo.
KMBC 950
WDAF 610
WOQ 1300
Knoxville, Tenn.
WNOX 560
La Crosse, Wis.
WKBH 1380
La Prairie (Montreal), Que.
CRCM 910
Lawrence, Kans.
WREN 1220
Lansing, Mich.
WKAR 1040
Lincoln, Nebr.
KFAB 770
Little Rock, Ark.
KLRA 1390
Long Beach, Cal.
KFOX 1250
KGER 1360
Los Angeles, Cal.
KECA 1430
KFAC 1300
KFI 640
KHJ 900
KNX 1050
Louisville, Ky.
WAVE 940
WHAS 820
Lulu Island (Vancouver Island), B. C.
CRCV 1100
Madison, Wis.
WHA 940
Mexico City, Mexico
XEB 1030
XEN 711
XEW 910
XFG 638
XFI 818
XEFO 940
XETR 610
Miami Beach, Fla.
WMBF 1300
Miami, Fla.
WIOD 1300
WQAM 560
Milwaukee, Wis.
WTMJ 620
Minneapolis, Minn.
WCCO 810
WDGY 1180
WLB 1250
WRHM 1250
Montreal, Que.
CKAC 730
Nashville, Tenn.
WLAC 1470
WSM 650
Newark, N. J.
WAAM 1250
WNEW 1250
WOR 710
New Orleans, La.
WDSU 1250
WWL 850
New York, N. Y.
WABC 860
WEAF 660
WFAB 1300
WJZ 760
WLWL 1100
WOV 1130
Norfolk, Nebr.
WJAG 1060
Northfield, Minn.
WCAL 1250
Oakland, Cal.
KLX 880
Oklahoma, Okla.
WKY 900
KOMA 1480
Omaha, Nebr.
WOW 590
Ottawa, Ont.
CRCO 880
Philadelphia, Pa.
WCAU 1170
Piedras Negras, Coahuila
XEPN 585
Pittsburgh, Pa.
KDKA 980
WCAE 1220
WJAS 1290
Portland, Me.
WCSH 940
Portland, Ore.
KEX 1180
KGW 620
KOIN 940
Pullman, Wash.
KWSC 1220
Raleigh, N. C.
WFTF 680
Reading, Pa.
WEEU 830
Reynosa, Tamaulipas
XEAW 956
Richmond, Va.
WRVA 1110
Rochester, N. Y.
WHAM 1150
Salt Lake City, Utah
KDYL 1290
KSL 1130
San Antonio, Tex.
KTSA 1290
WOAI 1190
San Diego, Cal.
KFSD 600
KGB 1330
San Francisco, Cal.
KFRC 610
KGO 790
KPO 680
KTAB 560
KYA 1230
San Juan, Puerto Rico
WKAQ 1240
Schenectady, N. Y.
WGY 790
Seattle, Wash.
KJR 970
KOL 1270
KOMO 920
KTW 1220
Shreveport, La.
KTBS 1450
KWKH 850
Sioux City, Iowa
KSCJ 1330
Sioux Falls, S. D.
KSOO 1110
Spokane, Wash.
KFPY 1340
KGA 1470
KHQ 590
Stevens Point, Wis.
WLBL 900
St. Joseph, Mo.
KFEQ 680
St. Louis, Mo.
KMOX 1090
KWK 1350
WEW 760
St. Paul, Minn.
KSTP 1460
Strathmore (Calgary), Alta.
CFCN 1030
Superior, Wis.
WEBC 1290
Syracuse, N. Y.
WFBL 1360
Tallmadge, Ohio
WADC 1320
Tampa, Fla.
WDAE 1220
Toledo, Ohio
WSPD 1340
Topeka, Kans.
WIBW 580
Toronto, Ont.
CRCT 960
Tulsa, Okla.
KVOO 1140
Twp. of Kingston (Toronto), Ont.
CFRB 690
Villa Acuna, Coahuila
XER 735
Wheeling, W. Va.
WWVA 1160
Wichita, Kans.
KFH 1300
Windsor, Ont.
CKLW 840
Winnipeg, Man.
CKY 910
Yankton, S. D.
WNAX 570
York, Pa.
WORK 1000
Zion, Ill.
WCBD 1080

[A]Stations listed include only those of 1000 watts power (or higher).

NOTE: Numbers following call letters indicate approximate dial setting.[11]



(This Warranty not applicable outside U.S.A.)

Your Delco Radio Carries the Same Guarantee As Your Car

"The manufacturer warrants each new radio receiving set manufactured by it to be free from defects in material and workmanship under normal use and service, its obligation under this warranty being limited to making good at its factory or designated Branches any part or parts thereof which shall within ninety (90) days or 4,000 miles whichever expires first, after installation of such auto radio receiving set for the original purchaser, be returned to it with transportation charges prepaid and which its examination shall disclose to its satisfaction to have been thus defective; this warranty being expressly in lieu of all other warranties expressed or implied and of all other obligations or liabilities on its part, and the manufacturer neither assumes nor authorizes any other person to assume for it any other liability in connection with the sale of its products."

"This warranty shall not apply to any radio receiving set which shall have been repaired or altered outside manufacturer's authorized Service Stations in any way so as in the judgment of the manufacturer to affect its stability, or on parts not made or authorized by the manufacturer have been used for replacement or other purposes, nor which has been subject to misuse, negligence, or accident."



Form No. 2095
Printed in U. S. A.

Page 1


Rebuilt 1 55-D
Delcotron Generator 1845985
Rebuilt by Delco-Remy. Division of General Motors, Anderson, Indiana, 46011
Made in U.S.A. 275829 Printed in U.S.A.
Page 2

12-17-71 DR-7086




2. If it is necessary to rotate the slip ring end frame to match the unit being replaced, remove the thru bolts, separate frames just far enough to rotate to desired position and replace thru bolts.

CAUTION: Separating the end frame too far causes the brushes to drop on to the greased shaft. If this happens, remove end frame completely, clean brushes with clean cloth, reassemble springs and brushes retaining them in position with a pin (toothpick). Remove pin after frames are reassembled.


3. When reusing the original fan, pulley and collar, tighten shaft nut to 40 to 60 lb. ft. If torque wrench is not available, insert a 5/16" hex wrench in end of shaft and tighten nut until the spring washer is just flattened.

4. Install Delcotron® Generator and check belt tension, mounting bolt tightness and make sure all electrical connections are clean and secure.

IMPORTANT: Never operate the Delcotron® Generator without being connected to the battery. Never attempt to polarize the Delcotron® Generator.

DELCO-REMY Division of General Motors Anderson, Indiana                   BPI

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Written and maintained by
Ronald Hunter
  Copyright © Ronald Hunter, 2005. All rights reserved.