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The worst products from HP and Tektronix.
william_b_noble:
RE the 8640B slide switches --- fighting that battle right now - a photo of a replacement metal part will save me some thinking about what might work ---aluminum, brass? bent up out of shim stock?
it looks like these are made out of two pieces somehow molded together based on the different colors of plastic. The key to "experimenting" is that it is so hard to get at these that it's pretty much impractical to try something and fail.
now updating it with some pictures of a kludy but hopefully effective repair - one was missing the handle, one had a broken handle.
.010 brass shim stock and a slice cut from the "handle" part of an old key and we have (see photos)
Zoli:
--- Quote from: william_b_noble on January 07, 2024, 09:29:32 pm ---RE the 8640B slide switches --- fighting that battle right now - a photo of a replacement metal part will save me some thinking about what might work ---aluminum, brass? bent up out of shim stock?
it looks like these are made out of two pieces somehow molded together based on the different colors of plastic. The key to "experimenting" is that it is so hard to get at these that it's pretty much impractical to try something and fail.
--- End quote ---
Try to replace it with a PCB - DIY from clad, or draw it up and order online. You can solder(carefully!!!) the contacts in place, or, if you find proper rivets, rivet them in place.
william_b_noble:
thanks - I updated my post just above to include the attempt to repair with shim stock - I'm waiting for the epoxy to finish drying before I reinstall and see what happens. it looks like it ought to be OK, and if so, the metal should last a lot longer than that plastic did... not only is it old plastic, but in a prior life it must have been near a window and the sunlight doesn't help either.
william_b_noble:
second hint for this signal generator ... there are white plastic gears that make up a differential, and the gears split - I just removed the gear and set the brass insert on my soldering iron and let it heat up, the gear wants to close back to how it was molded and that's what it did, it's all good now. try it.
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