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Tube-number record
7025A
1 archive entry
7025A is a tube type in the TubeDatabase archive (class: High-Mu Twin Triode Amplifier). Recorded specifications: brand Radio Valve Company Limited, construction Dual triode, base Glass, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 1 W. The archive holds 1 photographed example of this type.
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
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.
Datasheets
Datasheet: 7025A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.