Tube-number record
5A/102-A
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BrandStandard Valves
ClassOutput Pentode
Base6-pin
Filament7.5 V @ 0.85 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesConstant current type
Absolute Maximum Ratings
Plate Voltage180 V
Grid 2 Voltage150 V
Cathode Current50 mA
Audio Performance
Power Output1 W
Key Features
- Indirectly heated oxide coated cathode
- Constant current type
- Control grid top cap type B
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 180 V | 2500 | 43000 | 110 | — |
Application Notes
Maximum direct screen current 10 mA. Maximum control grid resistance using auto-bias is 500,000 ohms.
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