RF Power Grid Tubes · Tetrodes
4CX350A Ceramic Tetrode
Available on request
Eimac / CPI
4CX350A
Ceramic beam tetrode with 350 W plate dissipation for VHF and lower UHF amplification in broadcast and industrial applications.
- Plate Dissipation
- 350 W
- Max Frequency
- 150 MHz
- Max Plate Voltage
- 4.0 kV
- Max Plate Current
- 250 mA
Worldwide shipping
Cross-reference support
Grunius BV · Groningen, NL
4CX350A
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About the 4CX350A
The 4CX350A is a power tetrode manufactured by Eimac / CPI. Ceramic beam tetrode with 350 W plate dissipation for VHF and lower UHF amplification in broadcast and industrial applications.
Key ratings of the 4CX350A include tube type Beam Tetrode, plate dissipation 350 W, max plate voltage 4.0 kV, max plate current 250 mA, screen voltage 350 V and transconductance 27 mA/V.
Typical applications are VHF FM broadcast exciters, VHF communication transmitters, industrial RF heating and amateur VHF amplifiers. Notable features: 350 W ceramic-metal tetrode, 150 MHz VHF operation, higher power than 4CX250B and compatible socket family.
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 4CX350A 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 | 350 W |
| Max Plate Voltage | 4.0 kV |
| Max Plate Current | 250 mA |
| Screen Voltage | 350 V |
| Transconductance | 27 mA/V |
| Max Frequency | 150 MHz |
| Filament Voltage | 6.0 V |
| Filament Current | 2.75 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 FM broadcast exciters
- VHF communication transmitters
- Industrial RF heating
- Amateur VHF amplifiers
Key features
- 350 W ceramic-metal tetrode
- 150 MHz VHF operation
- Higher power than 4CX250B
- Compatible socket family
Related parts & equivalents
Recommended alongside or as alternatives to the 4CX350A.
Similar RF Power Grid Tubes
Comparable type, ratings, manufacturer or applications.
Vacuum capacitors for output networks
Often ordered with the 4CX350A for the same system.
Jennings UCSL 25–200 pF Variable Vacuum Capacitor 25 kV
Jennings Technology (CPI)
Capacitance Range 25–200 pF
Jennings UCSL 15–100 pF Variable Vacuum Capacitor 20 kV
Jennings Technology (CPI)
Capacitance Range 15–100 pF
Jennings UCSL 10–60 pF Variable Vacuum Capacitor
Jennings Technology (CPI)
Capacitance Range 10–60 pF
Frequently asked questions
What is the 4CX350A?
The 4CX350A is a power tetrode manufactured by Eimac / CPI. Ceramic beam tetrode with 350 W plate dissipation for VHF and lower UHF amplification in broadcast and industrial applications.
What are the specifications of the 4CX350A?
Tube Type: Beam Tetrode; Plate Dissipation: 350 W; Max Plate Voltage: 4.0 kV; Max Plate Current: 250 mA; Screen Voltage: 350 V; Transconductance: 27 mA/V; Max Frequency: 150 MHz; Filament Voltage: 6.0 V; Filament Current: 2.75 A; Envelope: Ceramic-metal.
What is the 4CX350A used for?
The 4CX350A is used in VHF FM broadcast exciters, VHF communication transmitters, industrial RF heating and amateur VHF amplifiers.
What are alternatives or related parts to the 4CX350A?
Related and comparable parts include 4CX250B, 4CX600J, 4CX1000A, 4CX1000K, 4CX250R and 4CX3000A. Contact PartnerTubes to confirm interchangeability for your equipment.
Where can I buy the 4CX350A?
The 4CX350A 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=4CX350A or email info@partnertubes.com.