Carvin Legacy 3 High Gain Option

These are adjustable bias amps and all you need to check and adjust the bias is a Multimeter if you're using the Carvin method. A more accurate method is to use a bias probe and a Multimeter, or our all-in-one Eurotubes "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 Carvin bias video for reference which we did on a V3.

The video below explains the difference between bias probe types.