Tube-number record
DH 7-91
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BrandPHILIPS
ClassCathode Ray Tube
BaseLoctal
Filament6.3 V @ 550 mA
Construction
Primary TypeDisplay / CRT
EnvelopeGlass
SectionsSingle gun
Filament / Heater
Heater NotesIndirect heating by A.C. or D.C.; parallel supply
Absolute Maximum Ratings
Plate Voltage1500 V
Plate Dissipation0.003 W
Grid 2 Voltage1500 V
Grid 1 Voltage-200 V
Audio Performance
Key Features
- High sensitivity
- Short persistence
- Direct viewing
- Symmetrical or asymmetrical deflection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Symmetrical Operation | 1000 V | — | — | — | — |
Application Notes
For optimum focus with symmetrical operation, the average potentials of the deflection plates and g2,g4 should be equal. With asymmetrical operation the potential of any deflection plate should not differ from Vg2,g4 by more than the deflection voltage.
Datasheets
Datasheet: DH7-91.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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