25A6
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BrandRCA
ClassPower Amplifier Pentode
BaseOctal
Filament25V @ 300mA
Construction
Primary TypePentode
EnvelopeMetal
SectionsSingle
Filament / Heater
Heater NotesA.C. or D.C.
Absolute Maximum Ratings
Plate Voltage180 V
Grid 2 Voltage135 V
H-C Voltage90 V
Audio Performance
Typical THD9%
Power Output2.75 W
Key Features
- All-Metal type
- Relatively large audio power handling
- Small Wafer Octal 7-Pin base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Power Amplifier (Condition 1) | 95V | 2000 | 45000 | 90 | 20mA |
| Class A Power Amplifier (Condition 2) | 135V | 2450 | 35000 | 85 | 37mA |
| Class A Power Amplifier (Condition 3) | 180V | 2500 | 40000 | 100 | 38mA |
Application Notes
Recommended for use in the output stage of radio receivers, especially those of the 'd-c power line' or 'universal' type.
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