I need help

OK - found a pick of Sansui RCA Phono Input shorting plugs on a later Sansui model from 1978, but you have to be registered (AudioKarma) to view the pics.

It’s the pic in the first post and the plugs have a paper instructional tag attached to them.

I don’t post there, but I recently registered because I like the site.

https://audiokarma.org/forums/threads/installed-phono-shorting-plugs-no-difference-noted-but-not-surprised.1078302/

DeKay

"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. 

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

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

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