Tube-number record
7490
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BrandStandard Telephones and Cables Limited (Brimar)
ClassMedium-Mu Double Triode
BaseNoval (B9A)
Filament12.6 V @ 300 mA
Construction
Primary TypeDual triode
EnvelopeGlass
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesPure tungsten heater designed for frequent switching; features center tap for parallel or series operation.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3 W
H-C Voltage200 V
Audio Performance
Key Features
- Rugged electrode construction
- Semi-automatic assembly
- Cathode interface resistance inhibition
- Low heater-cathode leakage
- Stable inter-electrode capacitances
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 250 V | 2250 | — | 32 | 6 mA |
Application Notes
Specifically designed for use in A.F. control and D.C. amplifier applications requiring high reliability.
Datasheets
Datasheet: 7490.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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