Tube-number record
7581-A
0 archive entries
7581-A is a tube type in the TubeDatabase archive (class: Beam Pentode). Recorded specifications: brand General Electric, construction Beam tetrode / beam power, base Micanol, socket Octal, maximum plate voltage 500 V, and maximum plate dissipation 35 W. The archive does not yet hold a photographed example of this type.
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
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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