Tube-number record
SC-3185
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BrandSYLVANIA
ClassCharacter Writing Tube
BaseCRT base (B12 family)
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
Envelope21-inch Rectangular Glass
SectionsCharacter Writing and Television Display
Filament / Heater
Absolute Maximum Ratings
Plate Voltage22000 V
Grid 2 Voltage700 V
Grid 1 Voltage-180 V
H-C Voltage200 V
Audio Performance
Key Features
- 21-inch Direct Viewed
- Rectangular Glass
- Spherical Faceplate
- Gray Filter Glass
- Low Voltage Electrostatic Focus
- Electrostatic Character Writing
- Magnetic Deflection
- No Ion Trap
- Aluminized Screen
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Grid Drive Service | 15000 V | — | — | — | — |
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