The BiasMaster™ is a precision tool designed to measure the bias current of EL84 and other tube types in your amplifier, allowing safe and accurate monitoring while adjusting your amp’s bias.

It comes with four novel probes and a bilingual English/German operation manual, making setup and use straightforward for both professionals and hobbyists.

While adjusting the amp’s bias control pot, the BiasMaster™ displays the actual bias current in real time, allowing you to explore the full range of bias settings your amplifier and tubes offer. This ensures you can set and achieve your ideal bias point for optimal performance.

Proper bias adjustment has a dramatic impact on an amp’s response, breakup, and dynamic character, making this tool essential for anyone seeking to get the best tone and performance from their tubes.