This is the tuning room. The variometer to
the rear is used for tuning and loading one of the 500kW sections (the outputs
are later combined). Note the large arc gap balls. These provide protection
for the final amplifier tubes in case of mistuning and static discharge
from storms and lightning strikes. Each one is monitored with a photoelectric
cell. When the cell detects the flash from an arc over, the output of the
transmitter is turned off for a split second. The items in the foreground
(large barrel looking things) are capacitors!