Tube-number record
7581-A
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BrandGeneral Electric
ClassBeam Pentode
BaseOctal
Filament6.3 V @ 0.9 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeT-12, Glass
Base MaterialMicanol
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation35 W
Grid 2 Voltage450 V
H-C Voltage200 V
Audio Performance
Typical THD10%
Power Output6.5 W
Key Features
- Beam power pentode
- AF power-amplifier applications
- Unilaterally interchangeable with 7581 and 6L6-GC
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Pentode | 250 V | 6000 | 22500 | — | 72 mA |
| Class A Pentode | 350 V | 5200 | 33000 | — | 54 mA |
Application Notes
The 7581-A is designed for high-fidelity audio power output. Maximum screen voltage rating is 500V in push-pull circuits with ultra-linear taps.
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