6BR7
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BrandBrimar
ClassScreened Pentode
BaseB9A
Filament6.3V @ 150mA
Construction
Primary TypePentode
EnvelopeT6-1/2
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated; Double spiral winding for reduced magnetic field.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation0.75 W
Grid 2 Voltage125 V
H-C Voltage100 V
Audio Performance
Typical THD5%
Key Features
- Low AF noise
- Low microphony
- Low hum
- Internal screening
- Rigid electrode structure
- Double spiral heater
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connected (Low Va) | 100V | 1100 | 1500000 | 20 | 2mA |
| Pentode Connected (High Va) | 250V | 1250 | 2400000 | 20 | 2.1mA |
| Triode Connected | 250V | 1720 | 11600 | 20 | 6.5mA |
Application Notes
Specifically designed for early stages of high-gain AF amplifiers. Low input and output capacitances also permit RF application up to 20 Mc/s.
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