thekid777

Altec 9470A pinout please New
« on: November 11, 2012, 10:17:53 PM »
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
« Last Edit: January 06, 2013, 09:04:13 PM by thekid777 »


rafafredd

Re: Altec 9470A pinout please
« Reply #1 on: November 14, 2012, 09:19:46 AM »
Isn't there schematics around?

I think so... Or was it just for 9475A?

EmRR

Re: Altec 9470A pinout please
« Reply #2 on: November 14, 2012, 10:45:29 AM »
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. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

thekid777

Re: Altec 9470A pinout please
« Reply #3 on: November 14, 2012, 01:05:32 PM »
Could you please show me a link about the connections please?
I started this thread because I wasn't able to find it.
Thanks!

EmRR

Re: Altec 9470A pinout please
« Reply #4 on: November 14, 2012, 02:30:16 PM »
searches:

Altec 470
Altec 475
Altec 9470
Altec 9475

http://www.groupdiy.com/index.php?topic=28723.20
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

thekid777

Re: Altec 9470A pinout please
« Reply #5 on: November 15, 2012, 07:57:56 AM »
Thanks Doug, I searched and saw this thread before but I don't see any pinout informations inside it?

EmRR

Re: Altec 9470A pinout please
« Reply #6 on: November 15, 2012, 10:09:34 AM »
It's there for power and ground. Everything is on the schematic which is online.
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

thekid777

Re: Altec 9470A pinout please New
« Reply #7 on: November 15, 2012, 02:54:33 PM »
I have the schematic but would be happy if someone could help giving the pinout
« Last Edit: January 06, 2013, 09:05:32 PM by thekid777 »

thekid777

Re: Altec 9470A pinout please
« Reply #8 on: November 17, 2012, 11:02:36 PM »
Help please!  :)

mjrippe

Re: Altec 9470A pinout please
« Reply #9 on: November 18, 2012, 01:41:23 PM »
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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