A wide use of microwave energy as energy spared and ecologically pure technology, continuously grows with each year [1].

In Ukraine the work within the program "Electronics-2000" on designing a microwave generators of power of 25 and 50 kW are stopped.

It is known that quantitative increase of unmatched sources of electromagnetic energy in the chamber of technological heating does not result in increase of useful microwaves power. Moreover generators working in unmatched mode destroy each other without changing all the microwaves power into useful load. Let's consider some basic peculiarities of several magnetron work in a chamber.