7B5-LT
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ClassPower Amplifier Pentode
Base8-Pin Octalox
Filament6.3V @ 400mA
Construction
Primary TypePentode
EnvelopeT-9
Base MaterialSmall wafer octalox with sleeve
SectionsSingle
Filament / Heater
Heater NotesNominal value: 7.0V, 430mA
Absolute Maximum Ratings
Plate Voltage345 V
Plate Dissipation8.5 W
Grid 2 Voltage250 V
Audio Performance
Typical THD11%
Power Output3.4 W
Key Features
- Small wafer octalox 8-pin with sleeve
- Vertical or Horizontal operating position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A (100V) | 100V | 1500 | 104000 | - | 9mA |
| Class A (250V) | 250V | 2300 | 68000 | - | 32mA |
| Class A (315V) | 315V | 2100 | 75000 | - | 25.5mA |
Application Notes
In circuits where the cathode is not directly connected to the heater, potential difference between heater and cathode should be kept as low as possible. Maximum grid circuit resistance is 0.1 megohm for fixed bias and 1.0 megohm for cathode bias.
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