C2 radio speaker

[Mike M.]

What is the correct wattage and ohm's for a C2 am fm radio speaker. i know this is in the archives but I'm not having any luck searching.

[Gerard F.]

Re: C2 radio speaker

Mike,

I think it is 10 ohm, not sure of the wattage. But it also has to have that little transformer attached to it because of the C2 radio transistor setup.

Take a look at this thread from the old archives:

https://www.ncrs.org/forum/archive24.cgi?review=206723

[Richard S.]

Re: C2 radio speaker

Mike,

I think it is 10 ohm, not sure of the wattage. But it also has to have that little transformer attached to it because of the C2 radio transistor setup.

Take a look at this thread from the old archives:
https://www.ncrs.org/forum/archive24.cgi?review=206723

Gerry,

Thanks for posting that thread. When you blew the main transistor in your radio using the speaker without the transformer, did you fix the radio yourself or did you have to send it out to a radio shop....thanks,

Rick.

[Gerard F.]

Re: C2 radio speaker

Rick,

I fixed it myself. Got a replacement DS501 transistor from Radio Schack online. Also was able to find an NOS volume-tone switch, which I also replaced. Cleaned it up real well and touched up a few other solder connections. With a new correct speaker, it now sounds like when it was brand new.

I also have the 65-67 radio diagragm and service manual in a pdf format. If you need a copy, email me.

One of my labor of love projects, probably took and cost 3 times had I sent it out. But I had fun doing it, with great satisfaction on the results.

[Bob L.]

Re: C2 radio speaker

Mike....it's a 10 ohm for sure.............I'm looking at the original that I took out of my 1966 coupe as I'm posting...#'s are as follows:

7282156
466528
10 OHM

[Gerald L.]

Re: C2 radio speaker

There is a DS-501 for sale on eBay as we speak. And the 65-67 on/off control switch can be had from VA Corvette if I recall. I have also heard that you should look for a coil and speaker which reads about 1.5 ohms; the repos read much less resistance, about 0.5 ohms. Believe that the lower resistance will drive more current thru radio making it run hot, but I have no personal experience with this.

If you wish to do repair yourself eBay for a Service Manual. Full of service hints, like if you turn the radio on and do not hear a immediate POP then the DS501 is blown.

[Bob L.]

Re: C2 radio speaker

Gerald......any ideas on the following:

Replaced the Radio w/ a rebuilt unit from Stoudt in PA. along w/the speaker....replaced antenna,Grd.mount plate,strap,mount bracket,scews & plate nut from Corvette Central........the only thing not repalced is the ant.cable...............FM radio sound is fine but the reception seems to be weak &fades somewhat (have to retune sometimes) >the AM is not much to speak of...did the ant. "tweak" thing per the manual.............any ideas??

[Gerald L.]

Re: C2 radio speaker

Sorry no real ideas, but this is not my area of expertise. How trusting of the Stoudt repaired unit are you, new capacitors and alignment or just prettied up? Recapping of old radios is a must , you can read about this on the net but any electolitic or paper caps must be replaced with modern capacitors for radio to operate 'as new'.

I can not get good AM either, but I'm 40 miles form a hi powered station. Does the FM get weak or fuzzy sounding after a while? Does the radio get real warm or hot over time?

If you are industrious enough, pull your antenna lead out of the radio and set up a conductivity test of both the antenna line and the ground circuit to the back, but I have no idea why it would be bad.

[Larry L.]

Re: C2 radio speaker

As an old RF Engineer - the radio needs to be tuned and the IF's realigned. When the raido is tuned it is a pretty hot radio.
Do your self a favor and replace the old coax cable - look for bends etc and be careful not to kink the new one. If it come to you folded up and not rolled up ship it back to where ever.
Once installled tune the antenna trimmer as the manual says. This affects AM only. Enjoy the real radio.
All of teplacement speakers are 8 or even 4 ohm and the transformer does not have enough steel in it to prevent saturation when you turn it up. Thats what distroys the Final Amplifier.
I also have the Sam's service manual for the 64 - 67 AM / FM. So if you see any old GM speaker of this size from the 60 gomp on to it. A new cone can be installed and its like new.

[Bob L.]

Re: C2 radio speaker

thanks Larry........that was my next step but really wanted an expert's opinion before spending MORE money on this 66 Head Turner!...will let you know BTW: any ideas of the best place to order the cable from???

Bob

[Gerald L.]

Re: C2 radio speaker

Bob, believe Larry is suggesting several actions; install new antenna cable and have the radio RF sections realigned by a repair shop, 'course trim the AM once back.

Larry, my antenna cable is too long, have it looped behind the kick panel. Are there after market tips with which I could shorten it? Googling has not helped.

[Dino L.]

C60 and the U69 C2 radio speaker

I was talking about the radio speaker in a C2 with C60 with a fellow member...he answered an ad in driveline where I am selling a complete AC unit and he asked me if I had the original AC speaker....now I thought I had the most complete set up ever...but I never thought to look in the AIM to see if the speaker was different...he said it was much flatter to clear AC under dash components....anyone been down this path?

[Dino L.]

A little deciphering on a C2 radio speaker

7282156
466528
10 OHM

Bob, on your speaker...the

7282156 is part number

466528 breaks down into 466 and 528
466 is the EIA code for delco speaker maker
528 is th edate code 5= 1965, 28th week

By the way...google EIA codes for more data on on off potentiometers in the radio to date them.

10 Ohm is not resistance, but actually impedance, the speaker coil has resistance as well as inductance from the voice coil winding. if you put an Ohm meter across the speaker leads, the speaker will not measure 10 but something less, say7-8 Ohms

Also from my guitar amp days....if your car has stereo and two speakers, make sure you orient the speaker leads correctly so the speaker are in phase....you do this by touching a 9 volt battery across the leads momentarily and look for the direction of the cone movement and make sure the stereo radio leads are connected the same way on the two speakers.

[Bob L.]

Re: C2 radio speaker

Thanks for the info....Dino.......about the A/C speaker thing.......never heard of a difference between a A/C speaker verses a non A/C speaker.....I replaced mine a while ago with no problem that I can remember.....as you can tell, I do have the original....if you need a pic, etc. let me know.....

[Mike M.]

Re: C2 radio speaker

The 63 I'm working on has a 4ohm speaker in it. The original is long gone. The owner says the radio had no volume and sounded like it had a bad ground. The speaker did not have the transformer attached. I hope the didn't burn out the transistor. Bubba had cut the wires when they put the new speaker in and wired it direct to the radio.
Mike