Visible in the upper right is the QSK relay T/R Control logic housed in a small die cast box. Immediately to the left is the plus 5 and plus 26 volt regulated power supplies. The large circuit board is the cathode keying and lamp logic circuitry. The lower left shows the relay for filament step-start action and the heat sink mounted grid bias transistor. The filament power transformer is just to the left of the grid compartment die-cast enclosure. The right center shows the input T circuit SWR matching coils and adjustable capacitor.