RCA Caps

IMO, for unused rca INPUT jacks shorting plugs are preferable to caps, although of course in many cases I would not expect either one to make any difference.

Caps will do nothing to reduce coupling of internally generated rfi/emi onto the unused input lines, from where it might couple into the signal path that is in use. The same goes for rfi/emi that may originate externally, but which enters the component via a pathway that bypasses the rca jack and then couples onto those unused input lines. Shorting plugs can help in either of those situations.

Shorting plugs should not be used on output jacks, of course.

Regards,
-- Al

Excellent response as always Almarg, I was going to mention the same thing. I also, have not experienced a difference when using the RCA caps. I need to mention that I have never had a problem with EMI/RFI either and therefore YMMV.

I am gonna buy some clear plastic jobbys, anyone that does vintage knows that the jacks are closer together and with the plastic jobbys I can cut the edge off to fit. I just wanna keep the dust ( dead skin ) off.

I have tried RCA plugs off and on over the years, but I could never hear a difference.