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Interesting stuff.
One nitpick, though. That 'scope is a dual TRACE unit, not a dual BEAM.
A dual beam scope actually has 2 separate electron guns in the CRT, with individual intensity and focus controls for each. The primary advantage of a dual beam scope is that it allows the use of different sweep speeds on each channel.
Examples of dual beam scopes would be the Tektronix 555 or 556.
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