Proudly MADE IN THE USA- no chinese junk here- these are built to last!

You are looking at a top quality SRS BiasTool, new, sealed, instruction sheet included.

Used world-wide by tube amplifier technicians for correct measuring of bias, a critical measurement and adjustment required when installing new output tubes in a tube amplifier.

Works with 5881, 6550, 7027, 8417, 6V6, 6L6, 6CA7, EL34, KT66, KT77, KT88, KT90, and many more- if you are unsure, or do not see your tube type listed here, please contact us prior to purchase to verify if this device works with your tubes and/or amplifier, and we will gladly help you out.

This listing is for one(1) SRS BiasTool only, brand new. The meters and amplifiers in the pictures are not included.