On Tue, 3 Jan 2017, Al Kossow wrote:
There are running LGP-30s. Should be short work with a digital oscillosope to capture the flux changes. Hopefully, someone has done this already.

Of course, we did this initially in 1999 when we got our first LGP-30, and a couple of times later on. The last time was a few months ago when we suspected a bad sector/track, but it turned out that there was a 50 Hz hum on the read amplifier supply voltage (an electrolytic cap on a module lost its capacity). We both have analog recordings (from digitizing scopes) and logic analyzer dumps. So concerning the LGP-30, all relevant information about the drum has been saved :-)

Christian

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