During its 1990 operation, 2 large RF systems were available on JET. The Ion Cyclotron Resonance Heating (ICRH) system was equipped with new Beryllium screens and with feedback matching systems. Specific impurities generated by ICRH were reduced to negligible level seven in the most stringent H-mode conditions. A record power of 22MW was coupled to the plasma. High quality H-modes (tE 2.5 tEQ) were achieved using dipole phasing. A new high confinement mode was discovered. It combines the properties of the H-mode regime to the low central diffusivities obtained by pellet injection. A value of nd tETi = 7.8x1020m­3s keV was obtained in this mode with Te~Tj ~11keV. In the L-mode regime, a record (140kW) D-3He fusion power was generated with 10-14 MW of ICRH at the 3He cyclotron frequency. Experiments were performed with the prototype launcher of the Lower Hybrid Current Drive (LHCD) systems with coupled power up to 1.6MW with current drive efficiencies up to 0.4 x 1020m­2 A/W. Fast electrons are driven by LHCD total temperatures of 100keV with a hollow radial profile. Paradoxically, LHCD induces central heating particularly in combination with ICRH. Finally we present the first observations of the synergistic acceleration of fast electrons by Transit Time Magnetic Pumping (TTMP) (from ICRH) and Electron Landau Damping (ELD) (from LHCD). The synergism generates TTMP current drive even without phasing the ICRH antennae.