The original probes, whose wire insulation has become brittle and badly cracked.

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   Chip (bytex64@awesome.garden)'s status on Sunday, 15-Feb-2026 20:26:49 JST Chip

   in reply to

   I can’t find a date anywhere, but this manual is definitely older than the one you can find online. It does mention “special germanium diodes” to protect the movement from overloads, but that could still be late 40s. All the diagrams depict tubes.

   Unfortunately the probes are knackered. I can rewire them, but the banana jack end is overmolded so it would have to be a splice job.