Tube-number record
7685
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BrandWestinghouse
ClassLinear Low-Mu Triode
BaseSpecial / none
Filament5 V @ 8000 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesStarting Current Max 24000 mA; Cold Resistance 0.1 Ohm
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation600 W
Grid 1 Voltage-800 V
Cathode Current500 mA
Audio Performance
Power Output1550 W
Key Features
- Forced air cooled anode
- Indirectly-heated
- Oxide-coated
- Unipotential design
- Linear low-mu
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class AB1 Power Amplifier (Two Tubes) | 4000 V | — | — | 6.5 | 635 mA |
Application Notes
The 7685 is designed for class AB or class B linear amplifier service in audio or RF applications including broadcast, SSB transmitters, ultrasonic generators, and sonar pulse amplifiers.
Datasheets
Datasheet: 7685.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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