Re: Telex Repair
The Radio Shack mic you linked to isn't going to do what you want. Aside from the physical differences, it's an electret (condensor) type while headset mics are typically dynamic. My quick and lazy searching didn't come up with details on the PH-1, but the PH-100 (presumably just a newer version) is definitely dynamic.
As others have said: the best thing to look for is a broken wire or solder joint either at the connector, or where the mic boom pivots. Things tend to break where they're stressed.
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