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Yes, there is a chassis which contain video amp and deflection circuitry, and a regulated HV power supply along with the projection CRT (3NP4), yoke, and projection optics and housing. Schematics for the duo-vue electronics and optics are available. Don't recall if it was in Sams or Riders or elsewhere. The 3NP4 CRTs are quite rugged and reliable.
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John Folsom
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