RF Power Grid Tubes · Tetrodes
GU-74B (GKT-74) Russian Beam Tetrode
Russian ceramic beam tetrode (GKT-74B) with 600 W plate dissipation, popular for HF and VHF amplifiers and widely used in amateur radio.
- Plate Dissipation
- 600 W
- Max Frequency
- 500 MHz
- Max Plate Voltage
- 2.7 kV
- Max Plate Current
- 600 mA
About the GU-74B
The GU-74B is a power tetrode manufactured by Svetlana / Reflector. Russian ceramic beam tetrode (GKT-74B) with 600 W plate dissipation, popular for HF and VHF amplifiers and widely used in amateur radio.
Key ratings of the GU-74B include tube type Beam Tetrode, plate dissipation 600 W, max plate voltage 2.7 kV, max plate current 600 mA, screen voltage 250 V and transconductance 35 mA/V.
Typical applications are HF linear power amplifiers, VHF amplifiers to 500 MHz, amateur radio high-power and military Russian HF communications. Notable features: 600 W plate dissipation, 500 MHz capable, russian military-grade construction and popular European amateur radio tube.
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 GU-74B 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 | 600 W |
| Max Plate Voltage | 2.7 kV |
| Max Plate Current | 600 mA |
| Screen Voltage | 250 V |
| Transconductance | 35 mA/V |
| Max Frequency | 500 MHz |
| Filament Voltage | 12.6 V |
| Filament Current | 2.5 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
- HF linear power amplifiers
- VHF amplifiers to 500 MHz
- Amateur radio high-power
- Military Russian HF communications
Key features
- 600 W plate dissipation
- 500 MHz capable
- Russian military-grade construction
- Popular European amateur radio tube
- Low filament power
Related parts & equivalents
Recommended alongside or as alternatives to the GU-74B.
Similar RF Power Grid Tubes
Comparable type, ratings, manufacturer or applications.
Vacuum capacitors for output networks
Often ordered with the GU-74B for the same system.
Frequently asked questions
What is the GU-74B?
The GU-74B is a power tetrode manufactured by Svetlana / Reflector. Russian ceramic beam tetrode (GKT-74B) with 600 W plate dissipation, popular for HF and VHF amplifiers and widely used in amateur radio.
What are the specifications of the GU-74B?
Tube Type: Beam Tetrode; Plate Dissipation: 600 W; Max Plate Voltage: 2.7 kV; Max Plate Current: 600 mA; Screen Voltage: 250 V; Transconductance: 35 mA/V; Max Frequency: 500 MHz; Filament Voltage: 12.6 V; Filament Current: 2.5 A; Envelope: Ceramic-metal.
What is the GU-74B used for?
The GU-74B is used in HF linear power amplifiers, VHF amplifiers to 500 MHz, amateur radio high-power and military Russian HF communications.
What are alternatives or related parts to the GU-74B?
Related and comparable parts include GU-43B, GU-84B, 4CX600J, 8877, 4CX250B and 4CX1000K. Contact PartnerTubes to confirm interchangeability for your equipment.
Where can I buy the GU-74B?
The GU-74B 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=GU-74B or email info@partnertubes.com.