You are looking at a BRAND NEW, SEALED, top quality SRS Dual Mini Bias Tool for EL84 / 6BQ5, and 7189 9-pin mini type output tubes.

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.

This dual unit can check two tubes at one time with one meter, without the need for powering down, waiting to cool, and switching to a different tube.

Great for any tube amp, including amplifiers with "bias balance" circuits- saves time and sanity.

Works with EL84, 6BQ5, E84L, EL84M, EL84S, 7189, 7189A, 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 device is *NOT* for amplifiers based on the larger 8-pin 6L6/6V6/EL34 type tubes- it is only for the 9-pin miniature tubes such as EL84/6BQ5/7189. Please contact us prior to purchase with your brand/model of amplifier if you are unsure, and we will help, no worries.

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