Marantz ST300 tuner

[Phil Allison]

Hi,

a Marantz ST300 arrived in good cosmetic condition and all lights working - but no audio from either AM or FM. Problem turned out to be the 28 pin IC at the heart of the unit has gone AWOL.

It's a distinctive looking sod with a metal grounding tab at one end - as indicated by a few pics found on the net.

But what is the number ?

Reckon it likely starts with "TDA..... "



.... Phil

 

>"Reckon it likely starts with "TDA..... "

Yeah, then you find it and find out you can't get quadrature, or itwon't ocne out of muting even with the switch. Or won't mute.

They weren't quite into change for the sake of a buck like today, but they did have the idea to be exclusive. that is why the "audiophools" for more for the 1970s stuff. Some of it did sound just as good or better, and there were practically no ICs. This shit can be fixed until the end of time.

 

[Tim Schwartz]

On 8/12/2015 3:09 AM, Phil Allison wrote:

Hi,

a Marantz ST300 arrived in good cosmetic condition and all lights working - but no audio from either AM or FM. Problem turned out to be the 28 pin IC at the heart of the unit has gone AWOL.

It's a distinctive looking sod with a metal grounding tab at one end - as indicated by a few pics found on the net.

But what is the number ?

Reckon it likely starts with "TDA..... "



... Phil


Good Morning Phil,

According to the service manual, Q206 is a AN7000. (Marantz pert
number HC10009020)

Good luck in your quest.

Regards,
Tim
Bristol Electronics

 

I will check, but I may still have one hanging around. I'll report back.

Dan

 

[Trevor Wilson]

On 12/08/2015 5:09 PM, Phil Allison wrote:

Hi,

a Marantz ST300 arrived in good cosmetic condition and all lights
working - but no audio from either AM or FM. Problem turned out to be
the 28 pin IC at the heart of the unit has gone AWOL.

It's a distinctive looking sod with a metal grounding tab at one end
- as indicated by a few pics found on the net.

But what is the number ?

Reckon it likely starts with "TDA..... "

**I replaced dozens of those suckers back in the 1970s and 1980s.
Extremely unreliable chips. As others have stated, it is an AN7000. WES
don't stock them (of course). I have one in my IC drawer, but it has
been pulled. I have no idea if it works. If you want to take a chance,
it yours for the cost of postage. A better idea might be to call Peter
Lengel at PJL Electronics. There is a chance he has some stashed away
for a rainy day.

--
Trevor Wilson
www.rageaudio.com.au

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