Tube-number record
2C39A
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2C39A is a tube type in the TubeDatabase archive (class: High-Mu UHF Triode). Recorded specifications: brand Eimac, construction Triode, base Metal, socket Coaxial, maximum plate voltage 1000 V, and maximum plate dissipation 100 W. The archive does not yet hold a photographed example of this type.
BrandEimac
ClassHigh-Mu UHF Triode
BaseCoaxial
Filament6.3 V @ 0.95 mA
Construction
Primary TypeTriode
EnvelopeCeramic-Metal
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesHeater voltage should be reduced at frequencies above 400 MHz to compensate for back-heating.
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| CW Power Amplifier 500 Mc | 800 V | 25000 | — | 100 | 80 mA |
| RF Oscillator 2500 Mc | 900 V | — | — | 100 | 90 mA |
| Plate-Modulated 500 Mc | 600 V | — | — | 100 | 65 mA |
Application Notes
Recommended heater voltage reduction: 6.0V (400-1000MHz), 5.5V (1000-1500MHz), 5.0V (1500-2000MHz), 4.5V (Above 2000MHz). Pre-heat time of 30-60 seconds required.
Datasheets
Datasheet: 2C39A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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