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2/5/11 1:19pm - Original Message: 'Took dash apart, U79 AM/FM Stereo option?'
2nd2ja Gold Member
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Lino Lakes, MN - USA

Vette(s):
71 Coupe LS5 454 Auto

Joined: 1/8/2009
Posts: 138

Found an interesting radio counterpart under my dash.

The code is DS-501. That number comes up as a Delco DS-501 transistor.
 
Online, here's what people are saying:
 
"... it seems this is a multiplex box to provide stereo sound from the stock radio."
 
"external aluminum heatsink w/ two(2) large DS-501 transistors on it along w/ a pair of caps."

Is this for stock radio? I think it may be the Stereo AM/FM option or U79 option.
 
I'm replacing my heater core, so i had to get in there. Found this interesting part.
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2/5/11 1:20pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
2nd2ja Gold Member
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Lino Lakes, MN - USA

Vette(s):
71 Coupe LS5 454 Auto

Joined: 1/8/2009
Posts: 138
On the back sode of the radio, there's a sticker. It was re-worked at some time.
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2/5/11 1:22pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
2nd2ja Gold Member
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Lino Lakes, MN - USA

Vette(s):
71 Coupe LS5 454 Auto

Joined: 1/8/2009
Posts: 138
I took down the RT speaker.
 
It has soldered wires! They're shot- sound-wise, just worn out.
 
I want to replace these. Are there universal size replacements?
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2/5/11 1:31pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
2nd2ja Gold Member
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Lino Lakes, MN - USA

Vette(s):
71 Coupe LS5 454 Auto

Joined: 1/8/2009
Posts: 138
Forgot. It's a '71.
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2/5/11 2:41pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
dskopp
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Oak Creek, WI - USA

Vette(s):
1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!

Joined: 5/21/2008
Posts: 1956
See if you can contact Jim (Norsky)  He lives up dere in dat Mn place heh??
Dan


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2/5/11 11:00pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
JoeTrecca
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Charlottesville, VA - USA

Vette(s):
1978 Silver Anniversary L82 Previously: 1965 300hp Coupe in 1967. 1967 435hp Coupe in 1968-70. 1969 350hp T-top w/ac and all power options.

Joined: 9/3/2010
Posts: 103
      I suggest that you check with our supporting vendors for replacement speakers. The stock size is 4x6. A big benefit of going with an aftermarket speaker is having a separate tweeter built-in for better high frequencies. That helps to hear the music over the rumble of a big block!      

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Joe T
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2/6/11 1:11pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
74-454 Lifetime Member
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, - Canada

Vette(s):
Coupe 74 - 454 Drive it like you stole it!

Joined: 8/6/2004
Posts: 533
Yes, they are 4x6, but I don't think you can connect "new" speakers to your original radio.  The circuitry is not compatible (something about ohm's I believe...).

I think they sell speakers that would fit the original radio; but you still won't get much out of them.  You could also go the other route; which is to replace the radio and speakers.  They sell some that have the decent 70's look face-wise, but have today's goody's (electronic circuit, aux input, ipod connection, sub connections,...).

Steph.
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2/6/11 1:37pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
That is simply the stock amplifier for the stock radio. The space available for the radios was limited, so in order to make it work the amplifier had to be a separate component. ALL early Sharks with a radio had this component mounted on the firewall. I believe the stereo systems had one other component mounted up there, too, but I may be wrong. In '77, a console re-design allowed the use of a "normal" radio head, ending the use of the separate amp system.
If your radio has a small, round, yellow/amber  light in the upper right side of the dial, it is a stereo unit. If it does not have the light, it is a mono unit. I think what you have is the basic, mono AM/FM radio set-up.

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2/7/11 12:59am - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
2nd2ja Gold Member
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Lino Lakes, MN - USA

Vette(s):
71 Coupe LS5 454 Auto

Joined: 1/8/2009
Posts: 138
Thanks for the advice.
 
Are you guys sure that my old radio won't work with the new speakers?
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2/7/11 1:31am - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
2nd2ja Gold Member
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Lino Lakes, MN - USA

Vette(s):
71 Coupe LS5 454 Auto

Joined: 1/8/2009
Posts: 138
I've found a few Sony 4 x 6 speakers at the local walmart.
 
They are listed as 4 ohms. If they are less than the stock 10 ohms, then I would think the radio would be fine, correct?
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2/7/11 1:35am - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
JoeTrecca
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Charlottesville, VA - USA

Vette(s):
1978 Silver Anniversary L82 Previously: 1965 300hp Coupe in 1967. 1967 435hp Coupe in 1968-70. 1969 350hp T-top w/ac and all power options.

Joined: 9/3/2010
Posts: 103
Hey Aaron,  I don't see any problem for the factory radio in replacing the stock speakers with aftermarkets. I recently changed out the original 4x6's (10 ohm) with a new pair of 4 ohm 2-way speakers, and the overall sound quality is improved. As always, avoid turning the volume up past the point of distortion (clipping).
I'd be happy to help you and any other members with questions about car stereo.
 
Mid America Motorworks has a link to an article on replacing dash speakers in a '72 Vette:
 
 
 
 


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2/7/11 11:34am - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
74-454 Lifetime Member
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, - Canada

Vette(s):
Coupe 74 - 454 Drive it like you stole it!

Joined: 8/6/2004
Posts: 533
Nope; I'm not certain that you can't, but a quick google search turned out these 2 interesting thread:

1) forum where the guy seems to say you have to use 10ohms aftermarket (sorry for a link to another forum...) http://www.digitalcorvettes.com/forums/showthread.php?t=38469

2) this guy sells classic car speakers and has really good info.  Seems like not having hte correct ohms would make the wires run hot... too hot....
http://www.turnswitch.com/speakers.htm

Again, I don't know for sure, but something's telling me you have to find the correct one's.  Even if the sound comes out fine; it doesn't mean you won't burn the wires...

You don't have to buy from him.... but give the second guy a call; looks like he knows what he's talking about!

and btw; you will most likely find out that aftermarket 4x6's don't fit "exactly" in the original 4 holes.  I think I got 2 ok, a 3rd fine and forced the 4th.  If I remember correclty, I had to bend/twist the speaker bracket a bit.

Steph.
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2/7/11 2:49pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
JoeTrecca
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Charlottesville, VA - USA

Vette(s):
1978 Silver Anniversary L82 Previously: 1965 300hp Coupe in 1967. 1967 435hp Coupe in 1968-70. 1969 350hp T-top w/ac and all power options.

Joined: 9/3/2010
Posts: 103
     Hey Aaron, I've still got those Delco 4x6 (10-ohm) speakers out of my '78 that you are welcome to have. They are in good shape - I changed them for speakers with tweeters to get more highs for my tin ears. I will be glad to send them to you, just PM me or send an e-mail with your shipping address:
 


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2/8/11 9:42pm - Reply: 'Took dash apart, U79 AM/FM Stereo option?'
2nd2ja Gold Member
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Lino Lakes, MN - USA

Vette(s):
71 Coupe LS5 454 Auto

Joined: 1/8/2009
Posts: 138
i appreciate the offer, but i'm going to put new ones in. After all, the dash is already all apart.
 
i wouldn't think these new speakers would make it run hot.
 
Yes, I saw many articles out there, including the '72 swap with new system. The only problem I had last year were my speakers hardly worked- they were shot.
 
Also, during the carpet rest, i found my antanea wire along the door sill was rusted in half. Gonna need a new wire that can be routed to the back.
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