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ID = 20436
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: DuMont Labs, Allen B., Inc. 
Tube type:  Oscilloscope CRT, picture tube   Indication 
Identical to 3WP1
Similar Tubes
Normally replaceable-slightly different:
  3WP11 ; 3WP2
Multiple differences or of other kind:
  CV3946 ; DG7-36
First Source (s)
31.Oct.1952 : Electron Tube Registration List

Base Duodecal (12-pin), B12A (not glass)
Was used by Technology / Measurement
Filament Vf 6.3 Volts / If 0.6 Ampere / Indirect

3-inch CRT, green, medium persistence trace. Electrostatic focus and deflection.

Dimensions (WHD)
incl. pins / tip
77 x x 296 mm / 3.03 x x 11.65 inch
Weight 370 g / 13.05 oz
Information source - - Manufacturers Literature   

3WP1: Personal file
Antonio Rabitti

3wp_pin.png 3WP1: Manufacturer's Literature
Emilio Ciardiello

More ...

Just Qvigstad
3WP1: Manufacturer's Literature
Emilio Ciardiello

More ...
Usage in Models 1= 1953 ; 1= 1955? ; 1= 1960??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

Collection of

Collection of a member from D


Forum contributions about this tube
Threads: 1 | Posts: 1
Hits: 2321     Replies: 0
3WP1 (3WP1)
Franz Harder
  1 This CRT has identical technical data and dimensions compared with 3WP2 (for details refer to 3WP2 data set).
It is only the Phosphor that makes the difference between various models:

3WP1 = green fluorescence / green phosphorescence / medium persistence
3WP2 = greenish-yellow fluorescence / greenish-yellow phosphorescence / long persistence
3WP11 = blue fluorescence / blue phosphorescence / short persistence         
End of forum contributions about this tube

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