RF Power Grid Tubes · Tetrodes
4CX1000K Ceramic Tetrode (VHF/UHF)
Available on request
Eimac / CPI
4CX1000K
Extended-frequency ceramic tetrode with 1 kW plate dissipation, optimized for VHF and lower UHF amplification up to 500 MHz.
- Plate Dissipation
- 1000 W
- Max Frequency
- 500 MHz
- Max Plate Voltage
- 4.5 kV
- Max Plate Current
- 450 mA
Worldwide shipping
Cross-reference support
Grunius BV · Groningen, NL
4CX1000K
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About the 4CX1000K
The 4CX1000K is a power tetrode manufactured by Eimac / CPI. Extended-frequency ceramic tetrode with 1 kW plate dissipation, optimized for VHF and lower UHF amplification up to 500 MHz.
Key ratings of the 4CX1000K include tube type Beam Tetrode, plate dissipation 1000 W, max plate voltage 4.5 kV, max plate current 450 mA, screen voltage 350 V and max frequency 500 MHz.
Typical applications are VHF/UHF broadcast transmitters, military VHF communications, VHF radar transmitters and pulsed UHF applications. Notable features: 500 MHz maximum frequency, optimized for VHF/UHF, 1 kW plate dissipation and low-interelectrode-capacitance design.
Power tetrodes add a screen grid to the triode structure, giving higher gain and lower drive power. They are widely used in FM and TV broadcast transmitters, HF communications, plasma heating and accelerator RF systems, usually together with vacuum capacitors in the output network.
PartnerTubes supplies the 4CX1000K worldwide from Groningen, the Netherlands — availability, lead time and price are confirmed per enquiry. Our team can help with equivalent and cross-reference types, sockets and accessories, and supply programmes for OEM and maintenance customers. Interchangeability must always be confirmed for the specific equipment.
Technical specifications
| Tube Type | Beam Tetrode |
|---|---|
| Plate Dissipation | 1000 W |
| Max Plate Voltage | 4.5 kV |
| Max Plate Current | 450 mA |
| Screen Voltage | 350 V |
| Max Frequency | 500 MHz |
| Filament Voltage | 7.5 V |
| Filament Current | 5.0 A |
| Envelope | Ceramic-metal |
Specifications are indicative and based on published manufacturer data. Always verify against the official datasheet and confirm suitability for your application before ordering.
Applications & features
Used in
- VHF/UHF broadcast transmitters
- Military VHF communications
- VHF radar transmitters
- Pulsed UHF applications
Key features
- 500 MHz maximum frequency
- Optimized for VHF/UHF
- 1 kW plate dissipation
- Low-interelectrode-capacitance design
Related parts & equivalents
Recommended alongside or as alternatives to the 4CX1000K.
Similar RF Power Grid Tubes
Comparable type, ratings, manufacturer or applications.
Vacuum capacitors for output networks
Often ordered with the 4CX1000K for the same system.
Jennings UCSL 15–100 pF Variable Vacuum Capacitor 20 kV
Jennings Technology (CPI)
Capacitance Range 15–100 pF
Jennings UCSL 25–200 pF Variable Vacuum Capacitor 25 kV
Jennings Technology (CPI)
Capacitance Range 25–200 pF
Jennings UCSL 10–60 pF Variable Vacuum Capacitor
Jennings Technology (CPI)
Capacitance Range 10–60 pF
Frequently asked questions
What is the 4CX1000K?
The 4CX1000K is a power tetrode manufactured by Eimac / CPI. Extended-frequency ceramic tetrode with 1 kW plate dissipation, optimized for VHF and lower UHF amplification up to 500 MHz.
What are the specifications of the 4CX1000K?
Tube Type: Beam Tetrode; Plate Dissipation: 1000 W; Max Plate Voltage: 4.5 kV; Max Plate Current: 450 mA; Screen Voltage: 350 V; Max Frequency: 500 MHz; Filament Voltage: 7.5 V; Filament Current: 5.0 A; Envelope: Ceramic-metal.
What is the 4CX1000K used for?
The 4CX1000K is used in VHF/UHF broadcast transmitters, military VHF communications, VHF radar transmitters and pulsed UHF applications.
What are alternatives or related parts to the 4CX1000K?
Related and comparable parts include 4CX1000A, 4CX3000A, 8877, 4CX10000D, 4CX15000A and 4CX250B. Contact PartnerTubes to confirm interchangeability for your equipment.
Where can I buy the 4CX1000K?
The 4CX1000K is available from PartnerTubes (Grunius BV, Groningen, Netherlands) with worldwide shipping. Availability and lead time are confirmed on request. Request a quote at https://www.partnertubes.com/contact/?part=4CX1000K or email info@partnertubes.com.