Tube-number record
9BR7
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9BR7 is a tube type in the TubeDatabase archive (class: Double Diode-Triode). Recorded specifications: construction Multi-section, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
ClassDouble Diode-Triode
BaseNoval (B9A)
Filament4.7 V @ 600 mA
Construction
Primary TypeMulti-section
EnvelopeT6 1/2 Glass
SectionsTwo high perveance diodes and a medium mu triode
Filament / Heater
MaterialCoated Unipotential
Warm-up Time11s
Heater NotesHeater Center Tap on Pin 9
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Grid 1 Voltage-50 V
H-C Voltage300 V
Audio Performance
Key Features
- High perveance diodes
- Medium mu triode
- Common cathode for diodes
- Internal shield
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250 V | 4000 | 10900 | 60 | 10 mA |
| Diode Section | — | — | — | — | 17 mA |
Application Notes
Heater warm-up time defined as time for heater voltage to reach 80% of rated value under specific series resistance conditions.
Datasheets
Datasheet: 9BR7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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