Vacuum tubes are manufactured to perform in a broad electrical range of based on design characteristics. Because of the variance during manufacturing, there may be as much as a 25% difference in test results in any given production run.

Amplifiers that have one bias adjustment for multiple tube applications are required to use matched power tubes to optimize tube performance as well as maximizing the life expectancy.

On amplifiers that have individual bias controls, it’s not typically necessary to have matched vacuum tubes.

Our experience over the last 30 years, however, has indicated that sonic performance is enhanced when each vacuum tube exhibits the same electrical characteristics in any given circuit design. Our matched vacuum tubes go through rigorous test procedures to enhance performance during their operation.

When you receive vacuum tubes from Penta Labs that are matched you can rest assured that you are receiving a product that has been thoroughly tested and will perform at levels unsurpassed in the industry.