GS35B HF amp tank considerations

A high-frequency (HF) and 6-meter amplifier is currently in the design phase, utilizing a single GS-35B tube. The designer has been gathering components over time and has acquired high-quality vacuum relays from a 5KW AM air traffic control transmitter. Additionally, there are two high-voltage vacuum capacitors rated at 35-1500 pF intended for tuning and loading the HF section. The design includes a vacuum relay to switch between different tank circuits, with a dedicated tank circuit for the 6-meter band. Further measurements of stray components are still required.

The proposed circuit design for the HF and 6-meter amplifier will incorporate a GS-35B tube, known for its high efficiency and capability to handle significant power levels, making it suitable for amateur radio applications. The amplifier will feature a robust power supply capable of providing the necessary high voltage to the tube, ensuring optimal performance.

The use of vacuum relays, specifically Jennings relays, allows for reliable switching between multiple tank circuits. This feature is essential for accommodating both HF and 6-meter operations. The relays will be configured to operate in a way that minimizes loss and maximizes efficiency during the switching process.

The high-voltage vacuum capacitors, rated at 35-1500 pF, will serve dual functions of tuning and loading within the HF section. Tuning capacitors are critical in adjusting the resonant frequency of the tank circuit, while loading capacitors help manage the power output and ensure linear operation of the amplifier.

The design will also include appropriate RF chokes and bypass capacitors to mitigate unwanted oscillations and maintain stability across the frequency range. Careful attention will be paid to the layout of the circuit to minimize stray capacitance and inductance, which can adversely affect performance.

To finalize the design, measurements of stray components will be conducted to ensure that the amplifier operates within the desired specifications. The overall goal is to create a versatile and efficient amplifier capable of delivering high-quality signals across the HF and 6-meter bands.Hi fellow hams I`m now in the design phase of a HF+6m amplifier, using a single GS-35B tube. I have been collecting parts for some time now and I have been quite lucky to be given some very nice vacuum relays (Jennings, spare in a 5KW AM Air traffic control transmitter). I also have two HV 35-1500pf vacuum capacitors that I plan to use for tune+load for the HF part. Plan is to use the vacuum relay to switch between tanks - have a separate 6m tank. I still have to measure the stray.. 🔗 External reference