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.
A well-designed selector switch of a preamp will short all inputs except the one selected. With the old style rotary selector switch this requires an additional "deck". No doubt this deck has been eliminated to reduce cost.
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.
@almarg
Is it even remotely possible that shorting plugs could cause some kind of "damage" (loosely and widely defined) to whatever audio equipment one would happen to install them on?
I can't envision a design in which a shorting plug applied to an RCA **input** would cause any problems. Consider the fact that the essentially zero ohm impedance presented to the input by a shorting plug is not greatly different than the very low output impedances (e.g., 10 ohms or perhaps even less in some cases) of some components that might be used to drive that input.
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