[Central-Electronics] MM-2

[K3PID]

I am not directly familiar with the MM-2 and it's been a long time since I've seen this but I seem to recall that if the horizontal sweep signal becomes nonlinear ( it should be a sawtooth ) the symptom is exactly what you describe. The one case that I do remember had the scan actually doubling back at the very end so it was a little hook shape that looked like a blob. What happens when you adjust the horizontal position?  If you switch to the x-y mode (if it has one, maybe for RTTY) the horizontal sweep generator is out of the circuit and if you then feed it a sine wave the ends should look fine.  

Just some thinking outloud! 

Ron H
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