This is a BRAND NEW, sealed SRS BiasKit 1 tube  amplifier bias setup. Includes one (1) BiasTool PVT plate voltage tester and one (1) BiasTool bias current tester, plus instructions on how to  hook up and use the devices.

The SRS BiasTool test adapter is used world-wide by tube amplifier technicians for correct setting of  bias current, a critical measurement and adjustment required when installing new output tubes in a tube amplifier.

The SRS BiasTool PVT test adapter allows safe, hands-free measurement of dangerous plate voltage in tube  amplifiers- a critical measurement for determining the correct maximum  safe bias setting in any tube amp.

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 kit is *not* compatible with the smaller 9-pin mini tubes such  as EL84, 6BQ5 and 7189- see our other listings for kits compatible  with those tubes and amplifiers.

If you are unsure if this  device is compatible with your amplifier or tubes, please contact us  prior to purchase, and we will help you select the correct devices for  your needs, no problem.

This listing is for the SRS BiasKit1 only. The meters and amplifiers pictured are for  demonstration purposes only and are not included.