Tube-number record
38
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BrandRCA
ClassPentode
Base5-pin
Filament6.3 V @ 300 mA
Construction
Primary TypePentode
EnvelopeST-12
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesHeater-cathode type, suitable for automobile and series-heater receivers.
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Typical THD8%
Power Output2.5 W
Key Features
- Heater-cathode type
- Relatively low heater current
- Suitable for automobile receivers
- Suitable for power-line-operated sets (series-heater)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Power Amplifier | 250 V | 1200 | 100000 | 120 | 22 mA |
| Class A Power Amplifier | 180 V | 1050 | 115000 | 120 | 14 mA |
| Class A Power Amplifier | 135 V | 925 | 130000 | 120 | 9 mA |
Application Notes
Recommended for single or push-pull power amplifier stages. Transformer or impedance coupling is preferred. If resistance coupling is used, the D-C resistance in the grid circuit should be limited to 1.0 megohm.
Datasheets
Datasheet: 38.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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