Before diving into soldering irons and variable resistors, it is vital to understand what lies beneath the metal casing. The Superstar 3900 is structurally almost identical to the famous Galaxy Saturn and the Connex 3300. It utilizes a PLL (Phase Locked Loop) frequency synthesizer system, often based on the MB8719 or MB8734 chips, paired with dual final transistors (usually 2SC1969 or 2SC2312).
Adjusting internal potentiometers can increase transmit power, but doing so without a wattmeter and dummy load can damage the finals. Adjust VR13 (Classic). SSB Power: Adjust VR12 to achieve roughly 12–15 watts. superstar 3900 mods