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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
2,634 posts
 

"Well, if working the amp without them won’t damage the amp, I’m OK."

It will not damage the amp without them. They are only necessary if you want to use an outboard amplifier or preamplifier with your unit. 

dekay's avatar
dekay
6,182 posts
 

Here is what is printed on the paper instructions tag in the photo I linked above...

IMPORTANT

Do not insert these pin plugs into jacks other than PHONO.

Inserting them into certain jacks will cut sound off.

 

This is what they look like if you can’t see the pic (and they are shorting caps).

https://www.amazon.com/pcs-GOLD-RCA-SHORTING-CAPS/dp/B06XFJZVMT/ref=sr_1_3?crid=1VOMXQPDW1S27&dib=eyJ2IjoiMSJ9.4AkKV6LDdyfciaJhGGXJct0bK7EeEMr2ySMEGjzsTfFBfWJJMvG_QA8oSCo7mbvcbq8E9sLe93jMy1Ogylt5xzTkHZrC3WfotBUUrr1M8FwcFcghUc_rYP5nPhgip1OL5NdSRKyKcj31qiWWX7CQTSLjYGNhRWn4gn5IRplCvy7aTIG9R3Qm6BkCcyLSzUv5vnI7UDC_rGn6ZTc_Ocx8EPL7jpxE6jxm4FEbspOyCBQ.SOCHikwmfSO0QFyoUwECtE2UxBXHr9w63irlcbg83zY&dib_tag=se&keywords=rca+shorting+plugs&qid=1776623218&sprefix=rca+shorting+plugs%2Caps%2C332&sr=8-3

 

 

"That is all."

 

DeKay

dill
2,634 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
6,182 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
2,634 posts
 

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

Installed

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