I've checked some of the other questions about similar books involving time travel, but this series is different from those.
In the late 1980s I read a series of Choose Your Own Adventure-style books where you have a time machine. I believe the series was fairly short, certainly not involving 10s of books. The main element I can remember is that the headquarters of the people who had invented the time machine were inside the Eiger Mountain. I can only remember one plot point, in which one set of choices in one story leads you to be put into suspended animation in the past, you end up in a museum in the future (as people had thought you were a classical statue), and you step off your plinth only to be electrocuted by an anti-theft device.
I hope these few elements are familiar to someone. I'm sure I'll know the books when I see them.