I had the same problem about one years ago. I have two SP3 loudspeakers, on on each receiver or both speakers, ore one receiver with the K3S audio effects that use both loudspeakers. The switch scratched when changing channel and it attenuated the audio signals. The italian service obtained from Elecraft USA the switch with the connected cable and we had to change it. The real problem seemed a part failure, but we had changed it after only little more than two years of use. I would like mil parts and radio with mil parts, but a Rhode Schwartz or a Cubic cost too much... Ian IK4EWX
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