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A hybrid oscillator operating at 12 GHz and 77 K was designed and characterised. The design incorporated on a single substrate a passive superconductive circuit and a 111-V active device. YBaCuO films (300nm), grown on MgO, had a surface resistance at 77 K of 0.3 m a scaled to 12 GHz. The DC and RF characteristics of the pseudomorphic HEMT showed minor differences before and after hybridation. The characterisation of a preliminary prototype oscillator including a superconducting resonator patterned on a MgO substrate, a gold matching network fabricated on A1203 and a transistor wire bonded gave a phase noise as low as-75 dBc/Hz at 10 KHz.