Tube-number record
WATER-COOLED POWER TETRODE
0 archive entries
WATER-COOLED POWER TETRODE is a tube type in the TubeDatabase archive (class: Transmitting Tube). Recorded specifications: brand EIMAC, year 1973, construction Tetrode, base Metal, socket Special / none, maximum plate voltage 22500 V, and maximum plate dissipation 1250000 W. The archive does not yet hold a photographed example of this type.
BrandEIMAC
ClassTransmitting Tube
BaseSpecial / none
Construction
Primary TypeTetrode
EnvelopeCeramic/Metal
Base MaterialMetal
SectionsSingle tetrode with two-section filament
Filament / Heater
MaterialThoriated-tungsten
Warm-up Time30s
Absolute Maximum Ratings
Plate Voltage22500 V
Plate Dissipation1250000 W
Grid 2 Voltage2500 V
Cathode Current125000 mA
Audio Performance
Key Features
- Water-cooled anode
- Ceramic/metal seals
- Two-section thoriated-tungsten filament
- Designed for megawatt power range
- Coaxial terminals
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Linear Amplifier Grid Driven Class AB1 | 20000 V | — | — | 4.5 | 86500 mA |
| RF Power Amplifier Class C Telegraphy/FM | 21500 V | — | — | 4.5 | 125000 mA |
| Plate Modulated RF Power Amplifier Class C Telephony (Carrier) | 17500 V | — | — | 4.5 | 95000 mA |
| Audio Frequency Power Amplifier Class AB (Per Tube) | 17500 V | — | — | 4.5 | 73100 mA |
Application Notes
The X-2159 is designed for very-high-powered MF or HF broadcast service. Filament sections may be fed in quadrature to reduce AC hum. High purity water (1-2 megohms/cm3) is essential for cooling.
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