The front panel where you can
see it uses a preset tuning control different in design to the
19 Set. The calibration of the dials is pretty similar however,
using opposite sides for the two wavebands. PA tuning looks to
be more comprehensive than that of the 19 Set which relies on
an external variometer for accurate aerial matching.
Another difference is the power
supply arrangements. The ZC1 uses a 12 volt vibrator and transformer
inside the case instead of an external setup. As you can see
by the toggle switch adjacent to the battery connector, battery
consumption can be reduced by switching off the transmitter.