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ID = 77844
United States of America (USA)
Brand: National Union Radio Corp.; Orange (NJ)
Developer: National Union Radio Corp.; Orange (NJ) 
Tube type:  Oscilloscope CRT, picture tube   Indication 
Identical to 1DP1_red-screen
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
26.Mar.1956 : Electron Tube Registration List

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 6.3 Volts / If 0.215 Ampere / Indirect

National Union made its family of 1-inch CRT, noval base, no exposed exhaust tip. They were available with different screens, P1, P4, P7, P11. There were also other tubes with the same electron gun but made to custom's specs. This developmental type has reddish phosphor.

  • 150V A1, 600V A2, -40V grid cutoff
  • 280V/inch vertical and horizontal deflection sensitivity.
Dimensions (WHD)
incl. pins / tip
30 x 103 x mm / 1.18 x 4.06 x inch
Information source -- Original-techn. papers.   
1DP1_red-screen: Private collection
Emilio Ciardiello


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