Corvette Radios 53~75

Corvette Radio Service
Factory Certified 1958 to 1975 models.

Crockett Sound Laboratory
729 Hwy 54 South
Alamo, TN. 38001
EMAIL

Lots more radio info on my main web www.WonderBarMan.com page so make sure to check it out!


Corvette Radios 1961 to 1967 use a speaker mounted loading coil with out this coil bias on speaker goes from the normal 1.5 Volts D.C. to 12 Volts D.C. burning out the voice coil in the speaker and, shorting out the DS-501 Output Transistor. 12 Volts on the speaker leads tells You Your radio needs the coil or the DS-501 is shored.

See NCRS DRIVE LINE VOLUME 31 #1 Summer 2004


Factory 6X9 Delco Corvette speaker with loading coil have an impedance of 1.5 Ohms!
Several radios come in with a replacement speaker with an impedance of .5 Ohms. This overheats outputs transistor in about 15 minutes witch then shorts and sounds becomes FUZZY! Once the temperature drops it will work fine until it gets hot again! After several heat cycles the output transistor will then over heat and, short out even with a correct value coil.

You can test the speaker loading coil in two ways.
Measure the DC Resistance across the speakers leads. IF it is less than 1.5 Ohms it will not work on the Corvette radios!
To test a speaker connected to a radio measure the DC Volts. Radio on volume all the way down DC Voltage will be 1.5 Volts on a correct value coil and 1.1 is the max on one with the .5 Ohm coil.

The only way I know of getting a clone of the coils Delco used is to order case, iron core lamanits, hand wind the coils, then assemble them myself.

1963 to 1967 Vett Coupes are the best sound chambers on the road! An ipod, MP3 player or 10 disk CD playing into the Delco then an Alesis nano verb feeding the power amps, Set the rear up with: one 15" bass speaker 600 watts, two 10" 300 watts per channel, two 6X9" 150 watts per, two mids and twetters up front 150 watts per channel 1 Then You have a system worthy to be in a CORVETTE! WARNING!: a system like this will make YOUR CORVETTE the center of attention where ever You go! and You will need a second battery in the rear to pull the load! Not to mention straps to keep from BLOWN the rear glass out!

1965, 1966, 1967 Corvette Radio Removal:
WARNING!: REMOVE BATTERY GROUND CABLE BEFORE ATTEMPTING RADIO REMOVAL!

A. Remove both side trim {the cover that Your knees would hit} from center dash console (one Phillips screw at top of each side).

B. Remove black plastic heat distributor duct two 5/16" screws. {under dash between gauges, radio, speaker}

C. Remove radio support screw (7/16" lower right hand side of radio).

D. Remove glove box. Disconnect speaker, antenna and power connections.

E. Remove knobs and hex nuts. {knobs may have a set screw that uses a allen wrench or flat blade screwdriver}

F. Carefully tilt radio top back. It may now be removed by carefully manipulating through the side.

To re install radio, reverse above procedure. Important: Be sure to peak antenna trimmer for AM after re installing. Radio performance may suffer if this is not done. {small flat blade that can be seen through a hole in dash with knobs off}

SPEAKER REMOVAL: Accessible after glove box removal. {Best to send in with unit i get nasty calls after radio is returned go through a two week battle to get folks to check speaker and then all the paper is gone?}


Now as to the 986281 1965, 1966, 1967 Delco Corvette Radio I have done at least 5K in my life time first one was in 1966 at the age of 13, two years before i got Certified by Delco. MOST of them did not work right from the factory suffering form poor assembly. I think this was the first radio some of these folks ever built they sho did not know how to solder! I get $300.00 to do other AM/FM MONO units that are clean cores BUT these units have tuning board problems that require me to completely disassemble radio and rebuild that board as well and since these are the only ones i have to do that to, i charge another $100.00 for that service, only takes a day IF i am lucky. For a TOTAL OF $400.00 + return shipping/handling/insurance.
69 Corvette Radio Removal:
WARNING!: REMOVE BATTERY GROUND CABLE BEFORE ATTEMPTING RADIO REMOVAL!

A. Remove right instrument panel pad. [5 Phillips screws]

B. Disconnect speaker connectors. NOTE: on some vehicles it may be necessary to remove the kick pads to access speaker connectors. [To remove door sil plate remove two 5/16 hex head screws and four Phillips screws.]

C. Remove tree wiper switch trim plate screws and tip plate for access to switch connector. Remove switch connector and trim plate from cluster assembly.

D. Unclip and remove right and left console forward trim pads. Remove forward most Phillips screw on right and left side of console.

E. Inserting a flexible drive socket between the console and metal horseshoe brace, remove the nuts from the two studs on the lower edge of the console cluster.

F. Remove remaining four Philips screws retaining cluster assembly to instrument panel.

G. From rear of console, disconnect radio electric connector, brace and antenna lead-in.

H. Remove radio knobs and bezel retaining nuts.

I. Pull top of console forward [toward ear of car.] Separate radio from console and remove it from the right side opening. CAUTION: The center instrument cluster trim plate is designed to collapse under impact. Consequently, do not try to deflect the cluster plate forward to gain more access to remove the radio. Also use care so as not to damage the plastic oil pressure line when pulling console forward.

SPEAKER REMOVAL:

G. Remove kick pads by removing three Phillips screws.

Remove two 3/8" screws and remove speaker.


1975 Corvette Radio Removal
WARNING:
REMOVE BATTERY GROUND CABLE BEFORE ATTEMPTING RADIO REMOVAL.

RADIO REMOVAL

A. Remove right instrument panel pad. [5 Phillips screws]
B. Disconnect speaker connectors.
C. Remove three wiper switch trim plate screws and tip plate for access to switch connector. Remove switch connector and trim plate from cluster assembly.
D. Remove forward most Phillips screw on right and left side of console. Unclip and remove right and left console forward trim pads.
E. Inserting a flexible drive socket between the console and the metal horseshoe brace, loosen the nuts on the two studs on the lower edge of the console cluster. [Do not remove nuts]
F. Remove remaining four Phillips screws retaining cluster assembly to instrument panel.
G. From rear of console, disconnect radio electric connector, brace and antenna lead-in.
H. Remove radio knobs and bezel retaining nuts.
I. Pull top of console forward [toward rear of car]. Separate radio from console and remove it from the right side opening. CAUTION: The center instrument cluster trim plate is designed to collapse under impact. Consequently, do not try to deflect the cluster plate forward to gain more access to remove the radio. Also use care so as not to damage the plastic oil pressure line when pulling console forward.

SPEAKER REMOVAL

I. Remove instrument panel cover by removing 6 Phillips screws along forward edge.
K. Remove 2 Phillips screws from window post pads and remove pads.
L. Pull instrument panel cover towards rear of car and remove.
M. Remove screws securing speakers and remove.



1953 to 1957 WonderBar Tuning take from the 57 Chevrolet Radio Service manual 3725156. [Are my comments.] These instructions are the same for all 53 to 57 Delco ''Wonder Bar'' radios found in all GM models.

AUTOMATIC TUNING:

The Corvette radio includes the "Wonder Bar" electronic tuner witch is operated electrically by depressing the "Wonder Bar" momentarily.
The tuner will electrically and automatically tune in the next station on the dial.
The sensitivity control can be set so the tuner will stop at all stations as just the high powered stations.
The radio can also be tuned manually by the manual tuning knob.
The tuner also includes five push buttons witch can be preset to automatically select five favorite local stations.

PROCEDURE FOR SETTING PUSH BUTTONS:

Turn on the receiver and allow for warm up. [Let radio play for about 15 minutes]
1. Open the hinged door below the dial exposing the five red selector tabs.
2. Tune in the desired station nearest the left end of the dial. [Push the "Wonder Bar" to tune in stations]
3. Move the first red selector tab (one farthest left) until it lines up with the pointer tip.
4. Repeat set up steps 2 and 3 for all red tabs and, push buttons. [First tab works only with first push button, second tab only with second push button, etc.]
5. Check the setting of each red selector tab by depressing the corresponding push button. IF the correct station is not tuned in, readjust the red selector tab; either slightly to the right of the dial pointer or slightly to the left of the dial pointer until the desired station is obtained by the push button.
[IF a working station is not found where You have red tab set for push button the pointer will not stop. Once a push button is seated push another push button or ''Wonder Bar'' to release it.]
[Push buttons are electrical switches and only require enough force to push them in to the click position. To much force breaks the mechanical stops and, ''JAMS'' stopping all the pushbuttons as well as the "Wonder Bar" function from working!]

TURNING ON COLD TUBES CAN BREAK THEM! IF it is below 40 degrees F. warm the inside of the car for about 15 minutes after heater starts to work to bring glass tubes up a safe temperature.



1956 & 57 Corvette radios are the only model to use a DC to AC inverter, instead of the traditional B+ power supply.

Of the 30 or so of these units i have serviced only one has B+ problems. In dealing with it i found that NO replacement transformer is made. Leaving a parts donor unit the only option.

Transformer is very small .5" bobbin with over a 1000 turns of 40awg wire [about the size of a human hair] making it very difficult to rewind and very time consuming, very costly.

On that same unit i also had problems with the audio output transformer going up in smoke after playing for several days. Failure was caused by the bad B+ power supply. Output transformer was not that difficult to rewind BUT when it smoked it took out the 2 audio output transistors AND, the 2 power supply transistors!





FACTORY CERTIFIED
1958 to 1975
DELCO CAR RADIO SERVICE

Crockett Sound Laboratory
Tony Mac Crutchfield
704 Hwy 54 South
Alamo TN 38001 USA

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The ONLY! Delco Certified Radio Service Shop for
Vintage Classic Delco Car Radios:

Including the signal seeking Wonder Bar. 1958 to 1975 Buick, Cadillac, Corvette, Chevrolet, GMC, Oldsmobile, Pontiac, Jaguar, Lincoln, Chrysler, Imperial, Avanti, Studebaker, Packard, Willys, Opel, Packard &, John Deere units.




OFFERING:
Complete Basic Electronic Restorations on analog Delco Radios made from 1958 to 1985.

Show quality bezel cosmetology on most models.

FIVE year warranty on the RADIO! Not who owns it! Parts installed and, Labor.

Speaker RESTORATION: Replacing all the soft parts that age using Delco's metal frame.


Audiophile modifications: Not only do my systems look original! They are original factory Delco electronics. With custom audio sound, that rival the best state of the art studio systems! 10,000 Watt amps, Sub Woofers, high frequency that destroy windshields! Or what ever Your hart desires I can make it happen!

Line Input to allow the Delco's to play iPods, CDs, Satellite radio, etc.

Line Output to drive massive Watt power amps. using Delco's tuner, volume and, tone to control sound.

Custom made wiring harness for a drop in installation of Hot-Rod audio components.

New High-Pro speakers that sound 10 times better than factory speakers! Set up with Sun Shield, Wiring harness, P.E.D. factory connectors, for most all makes and, model GM cars made from 1958 to 1985. Corvette High-Pro speakers set up to work with factory Delco radios using my hand would Delco clone loading coil.

Plus with modular design loosing a speaker or power amp does not complete shut down Your system.

ALL Work done in house!

PLEASE! consult my F.A.Q. T.O.A page before emailing or calling! You must agree to MY terms for me to agree to work on Your project!


To search page:
Push Your control then F key and a pop up search box will appear at the top of page. Type in info You seek and, it will take You to every area that word is used on a page.
58 years old with 50 years in electronic service.

Servicing thousands of Delco radios!

Repaired and, installed equipment for numerous Professional Recording Studios including RCA Nashville, WISHBONE, ARDENT, MEMPHIS SOUNDS, SUN. Along with live touring sound companies that travel the world, with top music stars.

Done live shows with Tom Jones, Ray Stevens, Bobbie Whitlock, Henry Gross, Cub Coda and, a great many more!

Wayne Jackson of the Memphis Horns said "I was as talented as any one ever to step through the doors of 1700 Popular" Birth place of the Jingle industry.

One half of a comeback since 2005. The owner of a 63 Corvette WonderBar had to have unit back to make the big car show! Unit would stop on FM Converter but not up to factory specs. So i returned it to him while i searched for a parts donor unit.




In the very unusual event, You have a problem with a unit i restored for You! Your project goes to the top of my work list!


No matter what make or model GM car You have You are making money on my services! With a none working radio You loose value! With one of my RESTORED Delco units adding to Your vehicles! VALUE!


I can make vintage Delco Car Radios sound a 1000 times better than any found in 1958 to 1985 GM cars or trucks! Out performing most all top of the line sound systems sold today! Not to be out done by ANY!
the Delco stays factory with my hidden easy replaceable, update-able black boxes! That are true audiophile quality! Not cheap disposable ''JUNK!'' All modifications supporting these wonders can be remove taking the Delco back to factory set up, with NO TRACE of them ever having been there.


Before i start on the long ''NO'' list. Please IF You are wanting to send me work do not any any way HESITATE to send me an eMail or call after 2PM central time. I do want and will take time to talk with You about Your project.

BUT do not have time to help You identify a unit to sell on eBay [all the info i have is on the model# code page]
Nore to help one hook up a barn fine aka eBay unit to see if it works! Witch should only be done by a qualified tech.

""NO TIME LINE PROGNOSTICATIONS!""

""NO RUSH JOBS!""
I will NOT return a unit until i fell the:
""JOB IS DONE RIGHT!""

"NO BEING RUSHED"
Send or calling with a 'just checking on the progress on my project is coming does one thing: ""SLOWS DOWN SHOP PROGRESS" And, on Your project most of all!
"NO RUST BUCKETS"
"NO RAT'S NEST"

After my Basic Electronic Restoration each unit receives at least two weeks playing time. More if they do not fell just right! For the E~Caps to seat. Unit to stabilize so rely-ability and, performance can be VERIFIED. Not assumed! Along with real world thermal testing of freezing, baking, cycling on and, off.

Not doing so leaves the door wide open for those dreaded ''COME BACKS!''
That i hate more than You do!


2012 In an effort to speed up turn around time on the 58~85 era units I no longer service the pre 1958 models. In the past 10 years or so. I have restored about 75 of these vibrator units. They consume a great deal of time because of my lack of expertise and, learning curve on them. The amount of parts that must be replaced in a Basic Electronic Restoration. With some parts only to be found in donor units and, the unbelievable price they go for now days.
I did enjoy the challenge of orientating my self to that era of technology but found my self forgetting about the weeks I was spending on them, losing jobs on 58~85 era units that i know like I know how to eat breakfast!

No Radios or Parts for sale!

NO FM conversions

NO Antenna repairs

NO tech advise outside of my restoration projects.





PLEASE! Do not send me a radio! Until I give You shipping authorization.

PLEASE! CONTACT me to check on my current work load.
I may have You ship unit IF i am working on other same model projects, or may ask You to reserve a place on my work list. By printing out and sending in this WORK ORDER with a $25.00 RSVP fee check. [fee will be deducted from the basic electronic restoration rate, but not refunded]
(((My goal is to work on units as i am requested to. BUT it is more productive to work on them in batches of like radios. The more of one unit i work on the more repeatable the work is. Then i do not have to think about witch way to turn a part to get it to fall into place, it just happens!)))

''PLEASE'' MAKE INFO ''READABLE''!

Please put a work order in with unit! when it is sent in. This work order is what i follow to restore You unit! I will remember nothing from a phone call or email so IF You do change work request keep reminding me of that change! OR it most likely will not get done!

If i have You send in RSVP or SHIP Give it time to make it into shop then send email. ALL EAMIL: WITH YOUR NAME AS SUBJECT. Stating that i should have received it. I will reply then save that email for further contact. When You ship use UPS tacking to follow Your project to my shop door.

If i do not confirm receipt of Your RSVP or SHIPMENT. Please send another email asking for it.




My electronic service skills come from going on my first TV service call with my Dad at the age of eight. Then growing up in his "BUD'S TV" shop in Alamo, TN. population 1900.

Certified and, trained by RCA & Motorola on there audio products at 13, Delco in 1967 at the age of 14.

I did not get Zenith's certification back in the day because they all ready had a TV tech in the area BUT i did do his audio work!




It is one thing to attend a training class offered by a manufacture Or work for them installing parts. BUT another to be CERTIFIED & PAID by DELCO to do there warranty work. i was the man? at the end of the production line that made the radios WORK!




In 1967 just as i turned 14 I was certified by Delco! The 43rd man ever to get such an accredation! Told i was the only one Delco found in a nation wide search through all the schools looking for "young ones" to train as there upcoming radio techs!

Amazed! my self! I was told that the golden age of radio was the 1930s `and, all the young ones of the day knew about radios was to go down to Walgreen's purchase a unit small enough to hide then use an ear piece in English class. They simply found know one else of my era even working in radio repair shops so they could be trained. Then started paying a not so bright 14 year old $125.00 flat rate for 2.5 hours on each unit they sent me. The Delco man said: "I was on my way"!

The next man on the list was 55 41 years older than i.

A few years later Dr. M.R. Bose was certified so i get to call him Jr.

I was told by the time i was 50. GM expected a 1958 Corvette to be worth $20,000.00 and they wanted to make sure there would be factory trained techs to take care of there radios!

Certified by N.A.P. on there digital audio products.

Working with the top of the line state of the art recording studio builders.

Live touring sound companies supplying equipment to the top music stars in the world.

50 years of on the job training in electronic sound system service! AND, I still learn on every unit i work on!

www.WonderBarMan.com Is my main page for Delco Car Radio info.



PLEASE! NOTE: While 99.999% of You reading this know my pricing reflects the unbelievable prices the Classic Cars bring today and money is not as much an issue for You as 'HOW LONG WILL IT TAKE!"!

There are some who do not realize that today most all of these vintage cars sell for 10 times or more than original selling price! Relying on them for years as Your daily transpiration!

So IF for any reasons PRICING is a problem! Let me know and, I will work with~in Your budget.

Heck with all the song writers around me! We may be able to get a Country Music Hit! out of Your story!


REWARD FOR DOCUMATION ON LATHE:
Used by T.A. Edison working on first light bulb?
H. Ford posted a $5M reward for?
Most FAMOUS lathe print in HISTORY?

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West Tennessee Music Samplour CD


PLEASE!: Listen to samples of the songs for free and, download album for $4.99 or single songs for $0.99 from COTTONFIELDS Recording Studio's only album to date!!!
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NCRS Member #35748