This is a typical 5F6-A Bassman build with the exception of a bias pot, external bias test points, and the impedance selector switch for use with 2/4/8 ohm Output transformer. Components are Sprague and Mallory Caps, Allen Bradley, Ohmite, and Vishay Dale resistors, Webervst Chassis, New Sensor PT, Mercury Magnetics FTBOM 2/4/8 ohm OT(the best combination of tweed bassman iron I have used to date). It runs at 417VDC Plate voltage with a weber copper cap rectifier and is biased at 44ma for a nice toneful 36.7 watts out Here are some pictures of the build process.