Tube-number record
7855/7855K
0 archive entries
7855/7855K is a tube type in the TubeDatabase archive (class: High-Mu Planar Triode). Recorded specifications: brand EIMAC (Varian), year 1971, construction Triode, base Metal, socket Coaxial, maximum plate voltage 2500 V, and maximum plate dissipation 100 W. The archive does not yet hold a photographed example of this type.
BrandEIMAC (Varian)
ClassHigh-Mu Planar Triode
BaseCoaxial
Filament6 V @ 1 mA
Construction
Primary TypeTriode
EnvelopeCeramic/Metal
Base MaterialMetal
Sections1
Filament / Heater
Heater NotesVoltage range 6.0 +/- 0.3 V; Current range 0.90 to 1.05 A
Absolute Maximum Ratings
Plate Voltage2500 V
Plate Dissipation100 W
Grid 1 Voltage-150 V
Audio Performance
Key Features
- Ruggedized
- Ceramic/metal construction
- Frequency stable anode
- Arc resistant cathode
- Forced air cooling (7855)
- Conduction/convection cooling (7855K)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics | 1000 V | 25000 | — | 80 | 70 mA |
| Grid Pulsed Oscillator (1.090 GHz) | 2000 V | — | — | — | 1300 mA |
Application Notes
Designed for grid pulsed, plate pulsed and CW operation in amplifiers, oscillators and frequency multipliers from low frequency to 3 GHz.
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