Hughes & Kettner Duotone Standard Retube Kit

These amps are adjustable bias. If you use the HK shunt method all that's necessary is a Multimeter. A more accurate and far easier method is to use one of our octal bias probes with a Multimeter, or our all-in-one octal "Pro One" bias probe (which reads plate voltage and plate current 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.