Tube-number record
20AP1, 20AP2, 20AP4, 20AP5
0 archive entries
20AP1, 20AP2, 20AP4, 20AP5 is a tube type in the TubeDatabase archive (class: Cathode-Ray Tube). Recorded specifications: brand Du Mont, year 1942, construction Display / CRT, socket CRT base (B12 family), and maximum plate voltage 4000 V. The archive does not yet hold a photographed example of this type.
BrandDu Mont
ClassCathode-Ray Tube
BaseCRT base (B12 family)
Filament2.5 V @ 2100 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesHeater current tolerance is +/- 0.3 A
Absolute Maximum Ratings
Plate Voltage4000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Operation 1 | 2000 V | — | — | — | — |
| Operation 2 | 4000 V | — | — | — | — |
Application Notes
The tube can be mounted in any position. A protective plate glass is recommended in front of the screen for safety in television receivers.
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