Superstar 3900 Mods Extra Quality

These usually use a menu-based or software-based method. You can often access a hidden menu by holding the UP button on the mic while turning the radio on. 2. Power and Modulation Adjustments

This is the most common Superstar 3900 mod. The radio uses a PLL (Phase Locked Loop) chip (usually the LC7131 or MB8719). By manipulating the "band" rotary switch and clipping diodes, we unlock hidden frequencies. superstar 3900 mods

The Superstar 3900 is notoriously noisy on AM receive. A simple mod replaces the stock audio op-amp. These usually use a menu-based or software-based method

This ratio (low dead key, high swing) is preferred for "big audio" and allows external linear amplifiers to operate more efficiently, as they are not taxed by a high constant carrier. Power and Modulation Adjustments This is the most

Inside the radio, mounted on the rear-left side of the main PCB, are small potentiometers (variable resistors).

This mod requires cutting a trace on the PCB and installing a toggle switch.

This involves modifying the AM regulator circuit.