9BR7
0 Tubes in archive
ClassDouble Diode-Triode
BaseSmall Button Miniature
Filament4.7V @ 600mA
Construction
Primary TypeDouble Diode-Triode
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 | 250V | 4000 | 10900 | 60 | 10mA |
| Diode Section | - | - | - | - | 17mA |
Application Notes
Heater warm-up time defined as time for heater voltage to reach 80% of rated value under specific series resistance conditions.
Datasheet Viewer
Loading datasheet...
Showing 1 to 0 of 0 results