Tube-number record
3135
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BrandTESLA
ClassOutput Pentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeMiniature
Base MaterialGlass
SectionsSingle
Filament / Heater
MaterialOxide
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation2 W
Grid 2 Voltage135 V
Grid 1 Voltage-30 V
Cathode Current25 mA
Audio Performance
Typical THD10%
Power Output0.7 W
Key Features
- Directly heated cathode
- Miniature 7-pin glass envelope
- Suppressor grid brought out separately
- Center-tapped filament for series/parallel operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A AF (135V) | 135 V | 1900 | 90000 | 171 | 14.8 mA |
| Class A AF (150V) | 150 V | 1900 | 100000 | 190 | 13.3 mA |
| RF Power Amplifier 10 Mc/s | 150 V | — | — | — | 18.5 mA |
Application Notes
Suitable as an AF output pentode in Class A or an RF power amplifier in Class C with suppressor grid modulation capability.
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