Odd ball amp here. Essentially a power amp with volume control on the front panel. Works fine directly off a phone but would benefit from the output of a preamp. Previous owner made this. Based on a Ching Sheng CS-02V0. Nice work on the build. Very neat, good solder, and clean install. Note the original NAD pads and switches have been removed from the back panel. Very clean sound, hooked up for a listen.