Switching Phono preamps

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Presumably these are stereo preamplifiers, so you need four rather than two poles if you simultaneously want to switch the inputs and the outputs. Besides, you need gold-plated rather than silver-plated contacts to reliably switch very-low-level signals. Silver contacts will work fine for a few months and then start to produce cracking sounds, which you can usually get rid of by switching back and forth a few times.
 
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