Tube-number record
50A5
0 archive entries
50A5 is a tube type in the TubeDatabase archive (class: Beam Pentode). Recorded specifications: brand TUNG-SOL, year 1947, construction Beam tetrode / beam power, socket Loctal, maximum plate voltage 200 V, and maximum plate dissipation 10 W. The archive does not yet hold a photographed example of this type.
BrandTUNG-SOL
ClassBeam Pentode
BaseLoctal
Filament50 V @ 150 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeT-9
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation10 W
Grid 2 Voltage117 V
Audio Performance
Typical THD10%
Power Output4.7 W
Key Features
- Coated Unipotential Cathode
- High power sensitivity
- Designed for AC/DC receivers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Case 1) | 110 V | 8200 | 10000 | — | 49 mA |
| Class A Amplifier (Case 2) | 200 V | 8250 | 35000 | — | 50 mA |
Application Notes
Delivers high power output with high power sensitivity from low supply voltages.
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