Tube-number record
7025A
1 Tube in archive
BrandRadio Valve Company Limited
ClassHigh-Mu Twin Triode Amplifier
BaseNoval (B9A)
Filament12.6 V @ 0.15 mA
Construction
Primary TypeDual triode
EnvelopeT-6 1/2
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesMid-point tapped heater for series or parallel operation
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 1 Voltage-50 V
H-C Voltage180 V
Audio Performance
Key Features
- Low hum
- Low microphonic noise
- Integral 9-pin base
- Separate cathode terminals
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Condition 1) | 100 V | 1250 | 80000 | 100 | 0.5 mA |
| Class A Amplifier (Condition 2) | 250 V | 1600 | 62500 | 100 | 1.2 mA |
Application Notes
Suitable for use in modern high gain audio amplifiers and television circuits where low hum and low microphonic noise is required.
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