Olds64

So, here's the radio troubleshooting chart from page 15-2 of my 71 CSM.



This chart references a radio service manual. What manual is that and are they readily available (even if only from time to time on Ebay)?

When I installed a single DIN radio in my 71 the OE AM/FM radio was barely operable. I think the OE speakers were rotten.

I was thinking it would be a good project to disassemble the radio and tune it. I noticed on the troubleshooting chart that it mentions technicians are unable to tune the radio to avoid picking up 2 stations at the same time. I @$$ume this means the radio is pretty simple without a tunable pre-selector and no band-pass/reject filters.

Has anybody done any tuning on these radios? Is there documentation that GM released that covers the internal workings of these radios?

Just a thought. I teach radio tuning for the FAA so hopefully I could understand any documentation available. Truthfully, I'd feel more comfortable tinkering with the radio vs. disassembling the 9.375 rear-end (the other subject I glanced at in my CSM this evening).

I think I just found it. Is this it?

https://www.ebay.com/itm/234730460948

rocketraider

Or a Sams Photofacts covering your radio works good. They're what most general radio service shops used.

Oldsguy

Jesse, I'm not sure you would get very far attempting to tune the radio without at least a signal generator and an o'scope. My bet is that the old capacitors in it are going to be the culprits for most of it's failure to tune well, they go out and lose value then your LC circuits are off and your discriminator is off, it's a dominoe effect.

Olds64

Thanks for the lead. I'll have to search for one of those manuals.

True. Tuning a radio without a good RF test set would be like trying to tune the engine in a classic Oldsmobile without a timing light and tachometer.

Mr Shifty Sidney

I may have one of these books. If you need a picture of something I can take a picture/scan.

Don W

matt69olds

The timing of this post couldn’t be better, I may be going there tomorrow.


There is a flea market/antique mall in Columbus indiana called Vic’s collectibles. Last time I was there he had a few of those radio manuals. I don’t recall what he was asking for them.

He also has a 69 Toronado that I have my eye on.

If your interested, message me and I’ll let you know what I find.

matt69olds

https://www.google.com/search?q=vic+...e-gws-wiz-serp


This is the place that had the radio manuals. I went there over the weekend, unfortunately he closed early that day. Definitely a unique place, he has some oddball stuff.

Olds64

Matt, thanks for thinking of my thread. If the owner of the curios shop has the 71 Delco Radio Service Manual or AR-75 Sam's Photocraft manual as Rocketraider posted please let me know.

PM sent.

Oldsguy

Jesse, remember that place down in Houston that had all that electronic stuff? They might also have or have access to Sam's manuals.

Olds64

Yeah, I thought that shop down in Houston might have a good, used RF test set too. For anyone finding this thread in the future, Oldsguy and I are referring to Electronic Parts Outlet in Houston, TX.

https://epohouston.com/