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I need help

I have, since 1975, an integrated amplifier by Sansui model AU 7700.

It had what I think were jumpers connected to the right and left entry RCA connectors of Phono 2 that I suppose were, in the absence of the Phono 2, to simulate it.

I also suppose that the jumpers have an specific impedance.
I recently send it to maintenance and the technician lost these jumpers.

If anyone is familiar with this equipment, and what I am calling jumpers, could you please check if I am right about my idea of their function and, if so, which is their  impedance so that I can manufacture a replacement?

Thank you very much for any information.

Fabio

fabio_zaidan
dill
2,633 posts
 

The OP is talking about uninsulated, bare metal U shaped plugs that go into the center only of a 2 wire rca jack.

dekay's avatar
dekay
6,180 posts
 

Dill:

Why do you think this?

Are the "jumpers" you mention depicted in the pic the OP posted that I cannot view on DropBox?

If so, why would they be used on unused phono inputs?

"That is all - again."

 

DeKay

dill
2,633 posts
 

The below link goes to a photo of the unit with the metal U plugs installed.

Installed

fabio_zaidan OP
4 posts
 

Dill, the jumpers shown in the photo are not necessary because, as you can see right above the jumpers, the connection  pre-main is made with a switch.

Please, check if you can access the link below. It’s a picture of the rear panel of my amp with the original shorting plugs connected to the Phono 2 input.

fabio_zaidan OP
4 posts
 

https://www.dropbox.com/scl/fi/y3b5ow88y0yn1sl4pdvqw/Capture.JPG?rlkey=tfv2sa95w7iye3mmp9480ii2l&st=waz66buw&dl=0

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