Abstract: A releasable cathode ray tube connector assembly exhibiting enhanced dielectric standoff for its high-voltage contacts, even at high altitudes where voltage breakdowns frequently can occur. A substantially rigid dielectric sleeve encircles a base portion of a high-voltage contact projecting from the cathode ray tube stem, and a resilient sleeve carried in a cylindrical recess of a mating plug assembly is sized to slide over this rigid sleeve and substantially fill the annular space surrounding the rigid sleeve. An enhanced voltage seal is thereby provided.