Tube-number record
3A/102-B
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BrandStandard Valves
ClassTriode
Base5-pin
Filament2.1 V @ 1 mA
Construction
Primary TypeTriode
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesConstant current type
Absolute Maximum Ratings
Plate Voltage190 V
Cathode Current1.5 mA
Audio Performance
Key Features
- Indirectly heated oxide coated cathode
- Anode connected to top cap type B
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Reference Constants | 130 V | 500 | 60000 | 30 | 0.75 mA |
| Typical Operation 1 | 130 V | — | — | — | 1 mA |
| Typical Operation 2 | 130 V | — | — | — | 1.7 mA |
| Typical Operation 3 | 160 V | — | — | — | 0.9 mA |
| Typical Operation 4 | 190 V | — | — | — | 1.4 mA |
| Typical Operation 5 | 190 V | — | — | — | 2.1 mA |
Application Notes
Small British 5 pin base. Nominal heater voltage 2.1V.
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