High-Power 144 MHz Linear Amplifier (GS-35b)
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GS-35b 144 MHz Linear Power Amplifier
Welcome to another high-power project in my amateur radio portfolio. This showcase features a meticulously constructed, heavy-duty linear power amplifier designed around the legendary GS-35b (ГС-35Б) ceramic triode. Engineered for maximum reliability and sustained output, this amplifier is built specifically for demanding 2-meter operations, making it an excellent choice for modern digital modes.
Technical Specifications
- Bands: 144 - 146 MHz (2-meter band)
- Active Components: 1 x GS-35b (ГС-35Б) Vacuum Ceramic Triode
- Input Power (Drive): 50 - 70 W
- Operating Modes: Highly suited for high duty cycle digital modes (FT8, MSK144), as well as SSB, CW, and FM.
- Power Supply: Integrated robust power supply featuring a massive transformer and high-capacity capacitor bank for stable high voltage under heavy load.
- Cooling: Heavy-duty forced-air cooling system with dual high-throughput exhaust fans for the RF deck and power supply sections.
Design & Construction Highlights
As detailed in the internal chassis photos, this amplifier is built without compromise. The layout, meticulous wiring, and premium component selection emphasize extreme durability and stable operation under continuous load.
The RF deck utilizes the military-grade GS-35b tube, highly regarded in the amateur community for its exceptional ruggedness and high linearity. To safely manage the substantial heat generated during constant-carrier transmissions (such as FT8 or MSK144), the chassis employs a carefully designed airflow system.
The front panel is designed for straightforward operation and monitoring. It includes dual analog meters for precise tracking of tuning parameters and operating currents. Dedicated heavy-duty Tune and Load controls allow the operator to achieve optimal impedance matching effortlessly.