Altec 9470A pinout please

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thekid777

Well-known member
Joined
Aug 1, 2009
Messages
455
Location
France
Hi, I have some problems: my 9470A is noisy
Maybe I did a bad wiring, could you please tell me the right pinout wiring for the pre?
Thanks for your help!
best regards
 
I've said it a dozen threads about these; number one mistake is forgetting a ground or shield connection.  Next mistake is not grounding PSU properly.  After that, you may have bad or noisy transistors. Does it make sound at all?  Connections are talked through in other threads already. 
 
Could you please show me a link about the connections please?
I started this thread because I wasn't able to find it.
Thanks!
 
searches:

Altec 470
Altec 475
Altec 9470
Altec 9475

http://www.groupdiy.com/index.php?topic=28723.20
 
It's there for power and ground. Everything is on the schematic which is online.
 
All of the pinout info is on the schematic, but you seem to think you may have gotten it wrong?  OK, here is the proper pinout for 150 ohms input and 600 ohms output:

Input: Connect to A and 4.  Tie 1 & B together, 3 & D together, A & C together, and 2 & 4 together.
Output: Connect to 10 and K.  Tie 9 & L together.
Power: +24VDC to pin 7, - (ground) to H
Ground: Tie H & J & 8 together.
 

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