47
0 Tubes in archive
BrandSylvania
ClassPower Pentode
Base5-B
Construction
Primary TypePentode
EnvelopeST-16
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage250 V
Audio Performance
Typical THD6%
Power Output2.7 W
Key Features
- High power sensitivity
- Power output pentode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250V | 2500 | 60000 | - | 31mA |
Application Notes
The tube 47 provides high power output for a relatively low drive voltage; a detector output of 11 volts RMS is generally sufficient for maximum power without distortion. For single tube usage, a 450 ohm bias resistor is recommended. In push-pull, 225 ohms is used and no shunt capacitor is required.
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