GU74B / 4CX800A
Russian Ceramic / Metal Power Tetrode NEW Tube
High Performance NOS (New Old Stock) Component – 800W Anode Dissipation
MAXIMUM RF RELIABILITY AND LONG LIFE
• DIRECT REPLACEMENT: 100% compatible as a plug-and-play replacement for all GU74B and 4CX800A tubes used in high-end commercial linear amplifiers and home-built projects.
• 800 WATT DISSIPATION: Thanks to its robust ceramic and metal construction, it guarantees a nominal plate dissipation index of 800W, with exceptional linearity in SSB and CW modes.
• TOP BRAND COMPATIBILITY: The ideal and recommended replacement for the renowned ACOM (1000, 1006, 1010, 2000A) and ALPHA (99, 91B, 8100) series amplifiers.
Peak Performance and Linearity
The Russian-made ceramic power tetrodes GU74B / 4CX800A represent technological excellence in RF pre-amplification and power amplification. With an input of 1200 Watts when used as a linear power amplifier, the tube conservatively produces 750W PEP in SSB and 750 Watts Key-Down in CW. When used in modern amplifiers equipped with automatic tuning circuits, vacuum, and advanced tube protection systems, the GU74B is capable of delivering significantly higher power while ensuring a very long operating life. Its characteristics allow for optimal use both as an RF amplifier with grid amplification and in grounded grid service.
PLATE DISSIPATION
800 Watt
TECHNOLOGY
Ceramic / Metal (NOS)
Specifications and Reference Codes
| Parameter / Identifier | Sales Specifications |
|---|---|
| Manufacturer ID / DXE Part | DXE-GU74B |
| Replacement Type | Thermionic valve / Power amplifier tube |
| Product Line | GU74B / 4CX800A Ceramic Power Tetrodes |
| Conservative Output (SSB/CW) | 750W PEP SSB / 750W Key-Down CW (with 1200W Input) |
| Alpha Amplifier Compatibility | Alpha 99, Alpha 91B, Alpha 8100 |
| Acom Amplifier Compatibility | ACOM 1000, ACOM 1006, ACOM 1010, ACOM 2000A |
| Package Quantity | Sold individually |
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