5XP

The DuMont 5XP is a family of flat-faced 5" CRTs with multi-band post accelerators, produced from 1948 onward. A 5XP-A series with tighter tolerances followed in 1953, and a 5XP-B range in 1954 that had an aluminized screen for higher brightness.

Compared to earlier tubes, they had improved vertical deflection sensitivity, which was achieved by decreasing vertical deflection plate width and reducing spacing between the plates, at the cost of limiting vertical scan to as little as 1.25" (at 20 kV acceleration).

Maximum post-acceleration voltage was 25.5 kV, typical conditions are stated as -2 kV on the cathode and +12 kV on the post-acceleration anode.

They are used in early models of the 513 and 517, before Tektronix switched these to Tek-made CRTs.

Links

• 5XP1A Datasheet (PDF)
• 5XP1B Datasheet (PDF)
• Peter Keller, The Cathode-Ray Tube: Technology, History, and Applications. Palisades Press, 1991. ISBN 0963155903, 9780963155900 p.105

Pictures

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  DuMont 5XP11

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  DuMont 5XP11