Marconi transmitter. It was the newest, was installed around 1987, and had only three tubes, one small as RF driver, one RF power tube and the modulator tube, which was in PWM system. Every time it stopped to made maintenance, there were the 80% posibilities to have a breakdown. Continental (e.g. 7/1) had 17, the same amount as the GE, but while changing a power tube in continental could last 5 minutes one person, here the used time could be four three technicians.