Tube-number record
9MP7
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9MP7 is a tube type in the TubeDatabase archive (class: Cathode Ray Tube). Recorded specifications: brand Research Enterprises, Ltd., construction Other / special, base Metal Shell, socket Octal, and maximum plate voltage 7700 V. The archive does not yet hold a photographed example of this type.
BrandResearch Enterprises, Ltd.
ClassCathode Ray Tube
BaseOctal
Filament6.3 V @ 600 mA
Construction
Primary TypeOther / special
EnvelopeJ72R2
Base MaterialMetal Shell
SectionsSingle
Filament / Heater
Heater NotesAllowable heater variation 10%
Absolute Maximum Ratings
Plate Voltage7700 V
Grid 2 Voltage330 V
H-C Voltage125 V
Audio Performance
Key Features
- Magnetic Focusing
- Magnetic Deflection
- High Vacuum
- Metal Base Shell
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation 1 | 4000 V | — | — | — | — |
| Typical Operation 2 | 6000 V | — | — | — | — |
Application Notes
Grid #2 may or may not be present; socket should be wired to accommodate it. Cut-off voltage is visual extinction of a stationary focused spot.
Datasheets
Datasheet: 9MP7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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