Palomar Max-Mod

The Palomar Max Mod is a high-current, high-power PNP transistor designed as an upgraded replacement for the modulation (AM regulator) circuit in many CB and 10-meter radios. It is not a modification in the traditional sense of altering a circuit design, but rather a robust component swap.
Features & Benefits
The Palomar Max Mod transistor provides several performance enhancements over stock components by offering superior power handling and heat dissipation capabilities.
Improved Heat Management: The transistor uses a massive TO-3PL package designed for improved heat dissipation, helping the radio run significantly cooler than with stock regulators, especially in high-power applications. This addresses a common weak spot in heavily modified radios where the original transistor is undersized for the circuit.
Increased Peak Power: By supplying the necessary current levels for maximum modulation, the Max Mod can increase the radio’s peak power levels by an average of 10% or more, according to the manufacturer.
Enhanced Stability: Users have reported that the heavy-duty design of the Max Mod provides a more stable operation, which can help prevent voltage drops that cause issues like dimming lights or audio “warble” on SSB transmissions when using a higher-output final and driver stage.
Direct Replacement: It is designed to replace common 2SB and TIP series power transistors (e.g., 2SB688, 2SB754, TIP36) and has the same lead spacing, making the soldering process relatively straightforward for technicians.
Included Components: It comes with a mica insulator, which is necessary for proper installation and heat transfer.
Compatibility
The Max Mod transistor is compatible with a wide range of popular CB and 10-meter radios, including models from brands such as:
Stryker
Anytone
Galaxy
President
It is a popular option sold by various radio customization shops as a standard upgrade for high-power setups.