Tube-number record
VTP 6990
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BrandVacuum Tube Products Co. Inc.
Class5" Tone Display Storage Tube
BaseNoval (B9A)
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsDual-gun (Writing Gun and Viewing Gun)
Filament / Heater
Heater NotesUnipotential Cathode
Absolute Maximum Ratings
Plate Voltage12000 V
Grid 2 Voltage500 V
Grid 1 Voltage-200 V
H-C Voltage125 V
Audio Performance
Key Features
- 5" Tone display
- High brightness for daylight viewing
- Variable persistence
- Selectable erasure
- Internal storage structure
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 8000 V | — | 5000 | — | — |
Application Notes
Zero volts is the black storage condition. Pulse erasure can be accomplished by application of pulses of +10 to +25 volts. Persistence may be varied from about 1 second to several minutes by varying pulse erasure width or repetition rate.
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