Tube-number record
ML-8139
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BrandMachlett
ClassDirect-View Storage Tube
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 600 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass with Integral Magnetic Shield
Base MaterialPotting compound in shield
SectionsWrite Gun and Flood Gun
Filament / Heater
Heater NotesFlood and Write guns both use 6.3V heaters
Absolute Maximum Ratings
Plate Voltage10000 V
Plate Dissipation10 W
Grid 2 Voltage200 V
Grid 1 Voltage-125 V
Cathode Current2 mA
H-C Voltage180 V
Audio Performance
Key Features
- Bright visual displays
- Half-tone images
- Electrostatically focused write gun
- Magnetically deflected write beam
- Integral magnetic shield
- High-altitude operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Viewing Section | 8000 V | — | — | — | — |
| Flood Gun | 80 V | — | — | — | 2 mA |
| Write Gun | -2500 V | — | — | — | 1.5 mA |
Application Notes
The tube features a useful storage time of approximately one minute. Useful screen diameter is 4 inches. Suitable for sea-level and high-altitude applications.
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