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#1
08-12-2013, 05:39 PM
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fix for a dead 70-77 gm am fm radio
70-77 am fm stereos use two delco modules for the preamp circuitry. The DM48. This radio had a bad one and as you may or may not know this part is not in reproduction. I reverse engineered the bad one and hand wired my own and it works perfect. This one is a prototype and I have also made this into a circuit board that will be a direct replacement for dead modules.
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#2
08-12-2013, 09:07 PM
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That is so awesome.
You should post an ad for said service in the classified. I have a 65 am fm that had the big power transistor (D-501 IIRC) that was bad. I replaced it and it works great. I was able to find a NOS transistor on E bay. Not to many guys that restore old car radios.Kudos |
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#3
08-13-2013, 01:48 PM
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I am finishing the circiut layout today and I should have working modules in house in a couple of week and the new module will be superior to the original by design. I am also remaking the larger DM28 found on plenty of early 70's delco am/fm stereo radios and even the casette player. I will post some pics later today. The availability of these parts should get alot of radios working again.
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#4
08-13-2013, 02:20 PM
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pic of my new module
Here it is. She's a beauty. Contact me if you need one. It should be available in a few weeks. Fully tested and plug and play.
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#5
07-21-2022, 02:52 PM
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I need this!!
I've been searching on line for DM48 chips for weeks... finally happened across this thread. I think this is still the only solution? It's 10 years later, you'd think there'd be options.
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#6
07-21-2022, 04:08 PM
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Check with S&M Electro-Tech aka Turnswitch.
They were super nice and sent me a used module. http://forums.maxperformanceinc.com/...ighlight=radio |
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#7
07-21-2022, 04:36 PM
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Quote:
__________________
"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather |
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#8
07-21-2022, 05:25 PM
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Oh that is unfortunate sad news. If it was Greg, he was an exceptional person and I'm sure will be missed by all he helped.
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#9
02-24-2023, 06:41 PM
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dm48
Hey j69shep,
I’m new to this forum. Been working on Delco radios for 15 years. Self taught in repairing the Delco 2700 and 2000 series. Every now and then I run across a part not being reproduced. This DM48 module is a hard one to find. I sure can appreciate some reverse engineering and someone taking the time to map this one out. Any chance of getting a couple of these completed DM-48 modules? I’ve been working on a ‘75 Delco Stereo. I am sure I have a bad one. |
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#10
02-25-2023, 06:51 AM
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Unfortunately, j69shep hasn't been to the site for a couple years, so you may not get a reply.
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#11
02-25-2023, 08:46 AM
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j69shep's contact info is on his Public Profile under vistor messages
__________________
 66 GTO, 495, M22, Strange S-60 w/4.10 Sold new at Ace Wilson's Royal Pontiac http://www.youtube.com/watch?v=cUHC-Z8xhtg |
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