Backert Labs MM/MC Phono Stage Excellent

This is a 2014 Backert Labs phono stage, the prototype for their Rhumba phono (latest version is $7800). It was built off of an Art Audio Vinyl One but I believe only the chassis and MC step up transformers were carried forward for this prototype.

It is very quiet in operation. It's designed with a 5751 based, proprietary gain circuit rather than the 12AX7s most often used in tube phono stages.

Reviews offer high praise for all Backert preamps (preamps are their sole focus). This phono uses much of the same design. The Spec Sheet in the pictures details the circuits and parts used. 

MC loading is 100 ohms and MM loading can be set at 47K or 1K (1K load was included for the Dynavector 10X5).

Sylvania Gold 5751 tubes are included. I also have an unused NOS pair of the same and a used pair of rare Raytheon black plate, windmill getter 5751s that test new. I'm open to including either/both of those at a great price.

You can hear it in this audio show clip. You'll hear Andy state that their patented power supply design is highly responsive, and delivers great rhythm and a lot of detail:  https://www.youtube.com/watch?v=RJ1Rv2721j4

It looks very good overall but it does have some nicks from its use in shows. It's missing one bolt for the case (underneath and the lid secures just fine).

Happy to answer any questions. Thanks for your interest!