Tube-number record
21EVP4
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BrandPHILCO
ClassTelevision Picture Tube
BaseCRT base (B7 family)
Filament2.68 V @ 450 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesControlled warm-up time for series string applications
Absolute Maximum Ratings
Plate Voltage20000 V
Grid 2 Voltage550 V
Grid 1 Voltage-155 V
H-C Voltage200 V
Audio Performance
Key Features
- Internal magnetic shielding
- Metal backed screen
- Straight gun
- No ion trap magnet
- Extremely short neck
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid Drive Service | 16000 V | — | — | — | — |
| Cathode Drive Service | 16000 V | — | — | — | — |
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