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Mar 7, 2002 | 11:54 PM

andyg

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Joined: Jun 2001

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From: Uxbridge MA

What is this?

I am installing a new radio and speakers into the '69. Bubba's Kraco has bit the dust and he blew out both the speakers. After pulling the passenger side dash, I found this transistor and heat sink. The wires coming from it on the left are not connected to anything. The plug was just dangling. What is this and what did bubba remove? Maybe Transistorized ignition? Thanks....

---Andy

Mar 8, 2002 | 12:03 AM

A C

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Joined: May 2000

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From: Bloomington MN

Cruise-In II Veteran

Re: What is this? (andyg)

That is actually the amplifier unit for the radio if I remember correctly....the radio in 69 was 2 part. The head unit and the amp.

AC

Mar 8, 2002 | 12:13 AM

Tom73

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From: NM

Re: What is this? (andyg)

That is what the service manual calls the "Heat Sink Assembly" It was used on both the mono AM/FM and the stereo AM/FM. The stereo AM/FM radio also had a "Multiplex Assembly", in the same general area. It was about 4 times the size of the heat sink assembly.

tom...

Mar 8, 2002 | 12:22 AM

andyg

Thread Starter

Instructor

Joined: Jun 2001

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From: Uxbridge MA

Re: What is this? (andyg)

Got to love the internet. Thanks for the quick responses and info...

--Andy

Mar 8, 2002 | 01:21 AM

dman535

Burning Brakes

Joined: Mar 2001

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From: Nashville TN

Re: What is this? (andyg)

This guy can help out with radio problems, does a lot of old Corvette stuff.

http://www.westechradio.com/

Mar 8, 2002 | 05:21 PM

A C

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From: Bloomington MN

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Re: What is this? (Tom73)

Quote:

Ah, that's what I have...the multiplex assembly. It is attached to the heat sink actually. I looked at the whole assembly and wondered why Toms was missing the other, much bigger piece :D

AC

Mar 8, 2002 | 05:34 PM

Tom73

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From: NM

Re: What is this? (A C)

Here is the reference drawing from the '73 service manual:

By this drawing it appears that the Heat Sink and the Multiplxer are not connected to eachother, both connect independently to the radio.

tom...

[Modified by Tom73, 3:36 PM 3/8/2002]

Mar 8, 2002 | 05:44 PM

Wrencher

Safety Car

Joined: Oct 1999

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From: NorCal

Re: What is this? (andyg)

All that stuff and they still sound terrible. Pretty typical of that era.

Hans

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Mar 8, 2002 | 06:12 PM

A C

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From: Bloomington MN

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Re: What is this? (Tom73)

Quote:

By this drawing it appears that the Heat Sink and the Multiplxer are not connected to eachother, both connect independently to the radio.

tom...

It may be a mid year design change or something (69's have lots of those). My heat sink is bolted directly to the top of my multiplex unit (which has it's own heat sink). My heat sink looks exactly like the one above, except for the mounting plate.

AC