VTP 6991
0 Tubes in archive
BrandVacuum Tube Products Co. Inc.
Class5" Tone Display Storage Tube
BaseB14-38 Med Shell Diheptal 14 pin
Filament6.3V @ 0.6mA
Construction
Primary TypeCathode Ray Tube (Storage Type)
EnvelopeGlass with Aluminized Standard P20 phosphor
Base MaterialMed Shell Diheptal
SectionsWriting gun and flood (viewing) gun
Filament / Heater
Heater NotesBoth writing gun and viewing gun heaters are 6.3V, 0.6A.
Absolute Maximum Ratings
Plate Voltage12000 V
Grid 2 Voltage500 V
Grid 1 Voltage-200 V
H-C Voltage125 V
Audio Performance
Key Features
- Ability to display tones
- Write, hold and erase at operator's option
- High brightness for daylight viewing
- Fast writing and erasure speeds
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Writing Gun | -1400V | - | 5000000 | - | - |
| Viewing Gun | - | - | - | - | - |
Application Notes
Zero volts is the black storage condition. Normal usage is to increase storage mesh positive approximately 20 volts to erase, then reduce to approximately zero volts, placing screen in the unwritten condition.
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