Coaxial Ferrimagnetic Nonlinear Transmission Lines (NLTL) can be utilized as High Power Microwave (HPM) sources. The output power of a single NLTL at a given frequency, and of a given size, is limited by the effect of line dimensions and charge voltage on operating frequency. Therefore, to achieve higher power levels, an array is required. To operate in microwave generation mode the ferrite domains are aligned along the axial direction of the NLTL using a biasing magnetic field generated by a dc current driven solenoid. This biasing method also provides a means of controlling the line delay by adjusting the magnetization of the ferrites using an auxiliary delay coil. By utilizing the delay coil and the primary biasing coil together on an NLTL, the operating frequency can be locked at a given frequency while the delay of the line can be independently adjusted. The relationship between the delay coil field and the corresponding temporal delay is investigated and two NLTLs are combined using the phase control method described.