Hughes & Kettner Trilogy Standard Retube Kit

These are adjustable bias amps and if you use the HK shunt method to measure bias all you need is a Multimeter. This method is a bit tedious to say the least, it's much easier, more accurate, and more convenient to use a bias probe and a Multimeter or our all-in-one "Pro One" bias probe that reads both the plate current and the plate voltage simultaneously. These are available under the "Related Products” tab.

You can use our Generic Bias Video for reference.

The video below explains the difference between bias probe types.