03-31-2010, 08:40 PM
I had occassion to take one of these apart to try and repair it. Came across an interesting "kink" in this swich. The switch is designed to choose four different ground paths which will affect the tone of the set. There are a total of four positions, in one it connects to nothing (second position). The switch body is physically grounded to the wiper and there are three terminals for cicuit connections (no wiper connection). The switch is an open design with only the pwr sw enclosed. I mention this because on a unit (37-650) that I'm working on there is no ground connection and there is an insulating circle of "fish paper" between the switch and ground so I have to look into that. If the switch body is to be grounded (and thus the wiper) why the "fish paper? The point of this post is that while working on the switch I noticed that the lug used to keep the switch oriented (keep it from turning) when you tighten it to chassis is directly in front of the third switch position and in this case was bent back to the point where it made contact with the third terminal. If left that way, no mater how the switch was turned, it would always be in the thrid position as far as the circuits are concerned. So if anyone out there doesn't seem to get any tone change when the switch is turned from position to position, check and see if that tab is grounded to the third terminal as mine was. Fix just involved small screw driver prying it off the terminal. It most likely got bent when someone didn't get the tab in the hole for it in the chassis and tightened it, bending it back agaInst terminal. (Philco part # 42-1184) PL
