Tube-number record
7498
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7498 is a tube type in the TubeDatabase archive (class: High Slope Pentode). Recorded specifications: brand Brimar, construction Pentode, socket Miniature 7-pin (B7G), maximum plate voltage 300 V, and maximum plate dissipation 3 W. The archive does not yet hold a photographed example of this type.
BrandBrimar
ClassHigh Slope Pentode
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 0.3 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesPure tungsten heater designed to withstand frequent heater switching.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3 W
Grid 2 Voltage300 V
H-C Voltage150 V
Audio Performance
Key Features
- Rugged electrode construction
- Semi-automatic assembly
- Low catastrophic failure rate
- Inhibited cathode interface resistance growth
- Tightly controlled glass strain patterns
- Very low change in inter-electrode capacitances
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Bogey Value | — | 7620 | — | 75 | 9.85 mA |
Application Notes
Specifically designed for RF and IF applications requiring high slope and reliability.
Datasheets
Datasheet: 7498.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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