Up for sale here is this brand new 6-pin pushbutton switch.  This will work great to replace pretty much all of the old Marantz 6-pin switches on the 1970s Marantz receivers.  It is the same dimensions as the old switches and will fit nicely into the board and into the metal frame.  Cleaning your old switches is a waste of time if you can just replace them.  This is a normal pushbutton switch--you push it once, it goes in and stays in, you push it again and it pops out.  I have other pushbutton switches listed, just take a look.

US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.

I have many more new parts and lots of vintage electronics listed--feel free to take a look!