LGP-30 Memory Drum Update

[Christian Corti]

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