spamtrap1888 wrote:

On Sep 4, 11:40 am, "Michael A. Terrell"
wrote:
Sparkey wrote:

Hey;

I just got this original 1971 Chrysler radio but it has distorted audio.
( Chrysler 3501013 Mark 07902)

Sam's list six 3501013 versions:
Volume Date On hand
3501013 (1BBC) 89 1971 Y
3501013 (GG01303) 104 1971 Y
3501013 (PG 73) 122 1972 Y
3501013 (1PD1209, 2DP1209) 128 1972 Y
3501013 (2PD1308) 157 1973 Y
3501013 179 1974 Y

Turns out that one of the 2 output transistors is shorted.

Both transistors have the Motorola icon and have the numbers 7239 and it looks like 7252 respectively.

Date codes: 39th & 52 week of 1972

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


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.


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


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:

359091 NTE 182 Q6
359092 NTE 196 Q7 ****** Looks like this was used.
or
359100 NTE 183 Q6
359101 NTE 197 Q7 ****** Looks like this was used.


I would check Q4 & Q5 before replacing the bad output, along with the
..31 Ohm fusible emitter resistors R35 & R36.

359117 NTE 123A Q4
359063` NTE 159 Q5
or
359116 NTE 123A Q4
359118` NTE 159 Q5


I would see if NTE has changed the replacement numbers in the last 40
years, before buying the parts.



359107 R35 & R36 .31 Ohm Wire wound with no wattage listed. From the
photo, I would use a two or three watt if either are open.

If the part numbers don't match, I will dig out the older manuals, but
this is a dirt simple complimentary audio amp.

I've been trying to identify them (here's a pic)
http://i582.photobucket.com/albums/s...o/MVC-205F.jpg

I get: "Status 503 Service Unavailable"

Me too, the first few times.


I've tried, for several hours with no luck. I just tried again, and
got the photo, but it isn't much use.


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.

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