1971 Chrysler Radio audio transistors ?

I'd have to believe those are date codes, Spark.

Jonesy

looks like 7252 respectively.

I would find a complementary (on the assumption 2 different datecodes) pair of TO126, 3 or 4A, 50 V or so transistors and jury-rig, in the first instance.

Sam's list six 3501013 versions: Volume Date On hand

like 7252 respectively.

Date codes: 39th & 52 week of 1972

I get: "Status 503 Service Unavailable"

I would think it would be in one of the last two manuals listed, but I'd like to see some photos beore I dig out the books.

io.

looks like 7252 respectively.

This is the craziest photo I've ever seen, if you want people to ID the transistor. Can you take a pic that's closer to 90 degrees than to

If the (working) one is not a Darlington, it's probably a complementary pair (one NPN, one PNP); modern equivalent-or-better would be MJE243 and MJE253; replace both and you can be assured the pair is truly complementary.

It's unlikely the 1971 transistor was of any type currently produced.

udio.

=A0Date =A0 =A0On hand

=A0Y

=A0 =A0Y

t looks like 7252 respectively.

Guess he's wrong about it being a 1971 radio then. If anything the date codes would be 1970, not 1972.

But why would they put the date code next to the logo?

Mee too, the first few times.

ut

If you want a good picture of leads on a power tab package you're in luck.

Go to Digikey, they have a selector, get something with gain like 100-300, = Vcex about 25, 5 amps and 50 watts Pd and you'll ne fine.=20

The only thing is this is going to be a low feedback design so if the origi= nals were germanium you need to give it more bias. In fact I am almost sure= tht one is shorted B-E from your symptom. Look at that driver circuit, ot = might need something, likely a small resistor.=20

There just ain't that much power there.=20

looks like 7252 respectively.

Motorola used the industry standard of a two digit year, followed by the two digit week.

All in that series would fit a '71 though '74 model. It may have been pulled out of a newer vehicle to replace the original, or a used car dealer may have bought it from a junk yard to put it in a car with no radio.

House numbered parts. OEM car radios were full of them. I repaired thousands of the things in the early and mid '70s, and maybe 100 in the mid '60s while I was still in school.

They used a six digit part number for all of the transistors, and only marked the last three digits

There are several different sets listed:

Vcex about 25, 5 amps and 50 watts Pd and you'll ne fine.

originals were germanium you need to give it more bias. In fact I am almost sure tht one is shorted B-E from your symptom. Look at that driver circuit, ot might need something, likely a small resistor.

Motorola never made Germanium power transistors in a flat epoxy package.

I don't think anyone did.

BTW, you would be surprised at how much it cost to make that radio. Less than $5 back then.

tm

Thanks for all the input.

I apologize for the pic, I know that photobucket was acting squirrely even when I was uploading this.

I will check on those NTE 196 and 197. The resistors that you mention appear to be good. So far, it's only that one transistor that went out.

Yeah, this radio came out of a "1971 Chrysler". Not surprised it good have been replaced or swapped with a newer one somewhere along the way.

Spark...