Discferret broken?

The DiscFerret won't help with this drum either. Speaking of experience (having two working LGP30s), you don't really need to digitize the drum if the machine (or more exactly, the matrix drivers and read FFs) are working, just hook up your logic analyser or whatever to the read FF and select the desired track. Your read clock is the main clock (137 kHz for the European version). Since there's no index pulse you need to read the C register together with the two clock tracks S2*/S3 to get the number of the next sector. The word mark is the sign bit. ... But you really only need to do that if you absolutely can't get your LGP30 working. When we got our first LGP30, before the machine itself was operational, we had dumped the drum with a Dolch logic analyser and found a mostly empty drum with some code fragment somewhere in the middle. We used some simple TL084 opamps to digitize the signal and feed it into the pod. Many years later we discovered that this is what is left after running the LGP30 acceptance test.