6A4
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BrandRCA
ClassPower-Amplifier Pentode
Base5-pin
Construction
Primary Typepentode
EnvelopeST-14
Filament / Heater
Absolute Maximum Ratings
Plate Voltage180 V
Grid 2 Voltage180 V
Audio Performance
Typical THD9%
Power Output1.4 W
Key Features
- Power-amplifier pentode
- 6.3-volt filament type
- Storage-battery operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 100V | 1200 | 83250 | 100 | 9mA |
| Class A1 | 135V | 1900 | 52600 | 100 | 14mA |
| Class A1 | 165V | 2100 | 48000 | 100 | 20mA |
| Class A1 | 180V | 2200 | 45500 | 100 | 22mA |
Application Notes
The 6A4 is recommended either singly or in push-pull combination. If resistance coupling is employed, the grid resistor should not exceed 0.5 megohm.
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