Tube-number record
7639
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BrandMullard
ClassTravelling wave tube amplifier
BaseSpecial / none
Filament6.3 V @ 400 mA
Construction
Primary TypeOther / special
EnvelopeGlass
Filament / Heater
Heater NotesRequired heater voltage range 6.0 to 9.0V, should be set to +/- 250mV of the value stated on tube for minimum noise factor.
Absolute Maximum Ratings
Plate Voltage1850 V
Plate Dissipation0.8 W
Grid 2 Voltage200 V
Grid 1 Voltage350 V
H-C Voltage50 V
Audio Performance
Power Output0.00001 W
Key Features
- Low power
- Broadband amplifier
- Unpackaged construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Input amplifier with periodic permanent magnet system | 1700 V | — | — | — | 0.35 mA |
Datasheets
Datasheet: 7639.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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