Originally Posted by Mooly
The Pioneer A400 uses a 'passive preamp' and so each record output switch simply places that tape output in parallel with the selected source.
There is a 2k series feed to each output.
So if you select record output 1 and 2 to be both CD, then both outputs are placed in parallel with the CD input sockets.
If you load the record outputs in any way, that load appears as a load across the selected source (CD in our example).
If you set the record selector to OFF then all output feeds are grounded and disconnected from the inputs.
That is the best option. Set to OFF. Job done.
I missed this earlier, apologies for not acknowledging it sooner. I did figure that out earlier with a glance at the schematic and a prod round with a multimeter but thank you for confirming it
My RCA plugs arrived today, made them into shorting plugs and I can no longer hear my CD player from any other source, nothing but dead silence, so I really do think they’ve helped with noise! But as advised, I won’t be putting anything on the outputs. Thanks all