Without getting into too much detail, changing the bias controls the amount of current that flows through the vacuum tubes of your amplifier, with each having an optimum setting. They also don’t wear at even rates meaning eventually some tubes will be working harder than others. No matter the manufacturer, how good the design is, or the quality of the parts used, tubes will eventually wear out. When prodding an amp keep one hand at your side - you don’t want to complete a circuit with your arms. Wear short sleeves and remove any rings or jewelry. Make sure the amp is unplugged before changing tubes or parts. Even when unplugged, the amplifiers capacitors are charged with enough high voltage to be fatal! Most is common sense but if you are ever uncertain, seek the help of a professional. We can’t stress this enough - make sure proper care is taken whenever operating or making adjustments to your tube amplifier.

Whether you currently own or are considering exploring the wonderful world of tube amplifiers, there are a few things you should know to make sure you get as much enjoyment and life out of your valve gear as possible! I am of course referring to tube bias - an important part of amp care that will increase tube life and the overall sonic performance of your stereo.

Adjusting amp steps