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As to the issue with the plugin, it has me rather baffled. Been thinking about pulling my good 3B3 from the 564B, and literally comparing them to see if anything is different. The two plugins are not that far apart in serial number, so should be pretty much identical.

After doing a comparison, my plan is to get out the extender and start doing voltage and signal tracing and see where that leads.

The symptoms are: Trace only extends from the right edge of the CRT to the last vertical graticule line before the center line of the CRT.

Trace will not trigger, but can be moved with horizontal control.

Trace disappears when Coupling lever is put into AC or DC positions.

Time/Div control appears to work, as does the Variable control. Can slow it down to clearly see the calibrator square wave.

There appears to be action when switching to Delay or Intensify.

As already stated, the trace when slowed down to say, .1 seconds, the dot progresses from the right edge of the CRT to that aforementioned graticule line, then repeats. However, when the trace stops, it leaves a constant bright spot at the end.