About the MA-300 Analog Bias Meter

Maintaining the correct bias current in tube power amplifiers is crucial for optimal performance, as it regulates the electron flow and ensures proper operation. Over time, as tubes break in and age, this bias current can drift from its ideal setting, necessitating regular adjustments.

Cary Audio’s MA-300 is designed to simplify this process for all Cary Audio vacuum tube amplifiers. This dedicated analog bias adjustment meter provides an immediate, accurate reading with a clearly defined needle that makes monitoring easy and stress-free. Unlike traditional multimeters, the MA-300 eliminates the hassle of selecting the proper scale or worrying about dead batteries—it strictly measures 0-300 milliamps of DC current, ensuring you always have the right reading.

The MA-300 is equipped with a 3-foot cord and a ¼-inch 2-conductor plug, allowing for easy connection to your amplifier. Once connected, you can effortlessly fine-tune the bias with a simple adjustment using a small screwdriver, achieving optimal performance from your amplifier. With its sleek steel stand, the MA-300 not only enhances your amplifier’s functionality but also adds a touch of elegance to your setup.

With the MA-300, keeping your amplifier in top shape has never been easier.