This is a small cabinet (about 7 inches long, 3.5 inches high, and 5.5 inches deep) with lots of electronic parts inside. Some of the parts are:
power on/off switch
indicator lights
4 -10 turn (Bourne) 20K vernier pots with locking knob
115V line cord
fuse holder
power supply and transformers
connectors
circuit cards
filter capacitors