Tube-number record
7499
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BrandBrimar
ClassHigh Slope Video Pentode
BaseNoval (B9A)
Filament6.3 V @ 750 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesPure tungsten heater designed to withstand frequent switching.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation4 W
Grid 2 Voltage200 V
Cathode Current85 mA
H-C Voltage2 V
Audio Performance
Key Features
- Rugged electrode construction
- Semi-automatic assembly
- Low catastrophic failure rate
- Inhibited cathode interface growth
- Pure tungsten heater
- Tight control of envelope strain patterns
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Video Amplifier (Bogey) | 250 V | 11000 | — | 26 | 40 mA |
Application Notes
The cathode sleeve is made of a special alloy to inhibit the growth of cathode interface resistance during long periods of operation under cut-off conditions.
Datasheets
Datasheet: 7499.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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