GR 7M
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ClassCold Cathode Register Tube
BaseB13B
Construction
Primary TypeCold Cathode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Cathode Current2.5 mA
Audio Performance
Key Features
- Long Life
- 7 Character
- End-Viewing
- Characters: +, -, V, A, 1, %, ~
- Filter coated dome
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| D.C. Operation | 140V | - | - | - | 2mA |
| Half-wave A.C. Supply | - | - | - | - | 1.5mA |
Application Notes
To minimize deterioration, the voltage between the conducting and non-conducting cathodes should be as high as possible.
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