Tube-number record
GR 7M
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ClassCold Cathode Register Tube
BaseCRT / special base
Construction
Primary TypeOther / special
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 | 140 V | — | — | — | 2 mA |
| Half-wave A.C. Supply | — | — | — | — | 1.5 mA |
Application Notes
To minimize deterioration, the voltage between the conducting and non-conducting cathodes should be as high as possible.
Datasheets
Datasheet: GR7M.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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