Broadcast & Communication
3CX20,000A7 20kW High-Mu Power Triode
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The Penta Laboratories 3CX20,000A7 20 kW HIGH MU Power Triode
Our 3CX20,000A7 is a high-mu power triode designed for demanding high-power RF applications. It excels as a zero-bias Class B RF amplifier or a Class C power amplifier or oscillator. The zero-bias operation simplifies circuit design, eliminating the need for a complex bias supply. Additionally, its high amplification factor allows for substantial power gain (up to 20 times) in grounded-grid configurations.
Designed in California - The Penta Labs Difference
Penta Labs is committed to delivering the highest quality vacuum tubes, rigorously tested to meet the most stringent performance standards. We believe that superior performance shouldn't come at a premium price. That's why our 3CX20,000A7 offers exceptional value, providing the same outstanding performance as other leading made in USA competitors at a fraction of the cost.
Key Features:
• High Plate Dissipation: Handles up to 20,000 watts, ideal for high-power RF applications
• Zero-Bias Operation: Simplifies circuit design for Class B RF amplifiers
• High Amplification Factor: Enables significant power gain in grounded-grid configurations
• Thoriated Tungsten Filament/Cathode: Provides reliable and efficient electron emission
• Coaxial Base: Ensures ease of installation and connection
Key Specifications:
Maximum Ratings:
Plate Dissipation: 20,000 Watts
Grid Dissipation: 500 Watts
Frequency for Max. Rating (CW): 110 MHz
Characteristics:
Amplification Factor: 200
Filament/Cathode: Thoriated Tungsten
Filament Voltage: 6.3 Volts
Filament Current: 160 Amps
Capacitances (Grounded Cathode):
Input: 61.0 pF
Output: 0.2 pF
Feedthrough: 360 pF
Capacitances (Grounded Grid):
Input: 61.0 pF
Output: 36.0 pF
Feedthrough: 0.2 pF
Mechanical:
o Cooling: Forced Air
o Base: Coaxial
o Air Socket: SK-1300
o Length: 8.75 in (222.20 mm)
o Diameter: 8.31 in (211.10 mm)
o Weight: 13.5 oz (6.15 kg)
Applications:
• High-power RF amplifiers: Ideal for broadcast, industrial, and scientific applications
• RF oscillators: Can be used to generate stable and powerful RF signals
• Grounded-grid amplifiers: Achieves high power gain with simplified circuitry
Note:
• The 3CX20,000A7 is a direct replacement for the 4CW50,000J
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