Uploaded June 2020 | Updated September 2026, 1 week ago

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In this video we go over step by step instructions on how to bias your vacuum tube amplifier.

Careful safety measures must be taken when working with internal amp components. High voltages and currents may be present, which can cause injury or death when handled incorrectly. You are responsible for your safety and the safety of others when working with electronic equipment. If you are not comfortable working with electronics, take your equipment to a trained amp technician.

Written instructions to follow while watching this video:

Bias Calculator: amplifiedparts.com/tech-articles/tube-amplifier-bias-calculator

Products/ Tools used in this video:

Apex Matched Power Tubes: amplifiedparts.com/products/vacuum_tubes?filters=2341a2517

A multi-meter (not the the multi-meter used in the video): amplifiedparts.com/products/digital-multimeter-yf-3220

Tube Amp Doctor Bias Master: amplifiedparts.com/products/bias-master-tad-tube-tester-4-probes

Speaker Cable: amplifiedparts.com/products/cable-14-2-spade-lugs-34

Screwdrivers: amplifiedparts.com/products/screwdriver-set-xcelite-precision-xp600-6-pieces

amplifiedparts.com/products/screwdriver-dunlop-system-65

Dunlop Magnetic Parts Tray: amplifiedparts.com/products/magnetic-parts-tray-dunlop-system-65

Other Tech Articles: amplifiedparts.com/tech-articles

To see new products we are carrying: amplifiedparts.com/products/new-products