New custom curcuit board, led lights and vintage glass tubes from new old stock still in the box until used to build this unit. The UNIT-0 preamp tube overdrive features powder coated flat black finish, custom tube configuration, tube crash guards and "nuke" switch. This system can be used for guitar, vocals, bass and keyboards and sports custom input/output configurations. The second input can also be used for control voltage or an additional output for stereo applications. Tubes are vintage broadcast/transmission applications and can be from manufacturers like RCA, Sylvania, Raytheon or other vintage stock. These are not common 12AX7 tubes but instead are rare, vintage and impossible to find components that have been in the box and on the shelf since as early as the 1950's. Includes 12v 20 watt power adapter with 4 AC plugs for use in other countries other than US and a standard US AC plug adapter and transformer dust cover.