Anyone know what these are?

[Isaac C.]

Are these just really big plugs, loading (capacitance/resistance) plugs, or something else? They came with my Hitachi SR 603 when I bought it earlier in the year but didn't pay much attention to them.

 

[thorpej]

Input shorting plugs maybe?

 

[Isaac C.]

Input shorting plugs maybe?

They were in the AUX if I remember correctly. What does that mean if they are shorting plugs?

 

[luvvinvinyl]

If you have an unused phono input, the shorting plug will prevent the sensitive input from picking up stray EM.

Yamaha receivers came with those, which are especially helpful on LOMC inputs.

 

[Isaac C.]

If you have an unused phono input, the shorting plug will prevent the sensitive input from picking up stray EM.

Yamaha receivers came with those, which are especially helpful on LOMC inputs.

So if I have my turntable plugged into the Phono, I can put these into the unused Aux to reduce interference?

 

[SpruceMoose]

You could put them there to store them, but I don’t think there will be any audible benefits. The aux input shouldn’t pick up any EMI.

 

[luvvinvinyl]

If they are caps, then, yes, you can store them that way. If they are actual shorting plugs, then, no, don't press them all the way down n the AUX or other line input jack.

 

[blhagstrom]

Shorting caps for unused phono inputs.
Usually provided with units with 2 phone inputs.

DO NOT store them in the tape out jacks.
Tape out is a live line on the current audio input selected.
Putting them in tape out will kill all audio and thus you will have no sound.

I've seen that mistake made twice now.

 

[Skywatcher]

Are these just really big plugs, loading (capacitance/resistance) plugs, or something else? They came with my Hitachi SR 603 when I bought it earlier in the year but didn't pay much attention to them.

As mentioned, they are shorting plugs for any unused Phono inputs *only*. If you aren't using them, just store them away in your favorite location.