roger2
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No need to go to the trouble of buying splitters if they are not needed. That switch likely won't break. Its contacts could be dirty the same as every switch in vintage gear could be. I would try without the splitters first.
https://www.parts-express.com/rca-y-adapter-2-male-to-1-female--240-125
https://www.parts-express.com/audte...o-dual-rca-male-y-adapter-cable-1-ft--181-451
Also found this on ebay. There are probably others there as well, I did not scroll through...
http://www.ebay.com/itm/Qty-2-7-RCA...908190?hash=item339bf5c85e:g:xe8AAOSwYvFZIdGj
https://www.parts-express.com/rca-y-adapter-2-male-to-1-female--240-125
https://www.parts-express.com/audte...o-dual-rca-male-y-adapter-cable-1-ft--181-451
Also found this on ebay. There are probably others there as well, I did not scroll through...
http://www.ebay.com/itm/Qty-2-7-RCA...908190?hash=item339bf5c85e:g:xe8AAOSwYvFZIdGj
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