Shematic diagram and design lay-out for 2m PA with 4CX1500-B is same as for 2m PA with 4CX1500-A, but calculated values for circuit elements for 4CX1500-B are as folows: Ccg=18pF Ctg=47pF Lg: D=14.5mm; n=1turn.; dw=1.5mm-2mm Cul Ct=15pF Cc=4.7pF La: D=45mm; n=1turn.; dw=5mm (lenght of connection wires 2x10mm max!) Cdk=2x500pF/6kV working voltage. Ua=2.5-3kV max! Ug2=300-325V stabilized. Ia=0.8-0.9A max Eff=55-60% Po=1.3-1.6kW max For good stability screen grid must have excellent RF blockade! The best stability is if screen grid is connected RF and DC directly to ground with cathode at proper -DC screen bias (-Ug2) and blocking capacitor to ground! All connections between elements and to ground must be as short as possible!