[Patrick Turner]

Edward Morris wrote:

Hello,
I have a C22 preamp and it has RCA shorting plugs in the Phono 2 inputs,
the Tuner 2 inputs, the tape head inputs and the MIC inputs. Are these
shorting plugs necessary and should they be used in all unused RCA inputs
jacks?

Thanks for your help,
Edward

Its a good idea to leave them all plugged into inputs you don't use.
They keep the inputs to the amp all biased to 0V and keep the noise low
if you switch to the grounded inputs. Grounded inputs do *no harm*. And
the sockets are sealed to keep out dust and pollutants that pile up
inside vacant RCA sockets to cause poor connections in future.

Patrick Turner.