Tube-number record
339A
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ClassPower Pentode
BaseOctal
Filament6.3 V @ 1000 mA
Construction
Primary TypePentode
Sectionssingle
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Power Output3.5 W
Key Features
- Suppressor-grid pentode
- Indirectly heated cathode
- Power outputs of approximately 3.5 watts
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation 1 | 250 V | — | — | — | 30 mA |
| Typical Operation 2 | 250 V | — | — | — | 30 mA |
| Typical Operation 3 | 250 V | — | — | — | 26 mA |
Application Notes
Intended for use primarily as an audio-frequency power amplifier where plate voltage is not in excess of 250 volts.
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