A solid-state switch in a deflection circuit includes a plurality of field-effect transistors (Q7, Q8, and Q9) connected in series. Each of the transistors (Q7, Q8, and Q9) is part of a switching module (20, 22, and 24) in the form of a three-terminal transistor circuit. Two of the modules (20 and 22) are connected to a common gating terminal (12) solely by diodes (D6 and D7) oriented so as (a) to conduct current in the direction required to provide a turn-on signal for the transistors (Q7 and Q8) but (b) to isolate the common gating terminal (12) from the high voltages experienced by the transistors (Q7 and Q8) when they are in their non-conducting states.