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I would look for the Eico 369. it has post marker injection. it is set up so the markers dont interfere with the trace. the 368 isnt post injection, but there are mods to make it post injection.
the precision E-410c is also post injection, but you need a seperate signal generator to produce the markers.
the eicos and the 410c have electronic sweep instead of a mechanical wobulator. id grab units with electronic sweep.
if you grab any of the RCA units, they are mechanical sweep, and also need the marker adder unit to show a good trace.
heathkit also made post injection units, but i dont know the model#.
the 415 was pretty much made for later color tvs in mind, althought it can be use on any tv with IF in the 40 mhz range
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