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ID = 58941
United States of America (USA)
Brand: National Union Radio Corp.; Orange (NJ)
Tube type:  Oscilloscope CRT, picture tube   Indication 
Identical to 1DP1
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

1-inch CRT, P1 screen, noval base, no exposed exhaust tip.
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: National Union - USA
John Albion

More ...
1DP1: Manufacturer's Literature
Emilio Ciardiello

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