2038 (GM)
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BrandRogers Radio Tubes Limited
ClassTriode Heptode Converter
BaseSmall octal shell
Filament20V @ 150mA
Construction
Primary TypeTriode-Heptode
EnvelopeST12 - Metal spray
Base MaterialSmall octal shell
Sections2
Filament / Heater
Heater NotesUnipotential cathode
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage100 V
Grid 1 Voltage-1 V
Cathode Current18 mA
Audio Performance
Key Features
- Miniature top cap
- Metal spray bulb
- Any mounting position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Converter Service (Column 1) | 100V | 520 | - | - | 1.4mA |
| Converter Service (Column 2) | 250V | 240 | - | - | - |
| Oscillator Section | 250V | 2300 | - | 15 | 8.5mA |
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