A circuit for driving gas discharge lamps (102, 104, 106) having heatable filaments (102A&B, 104A&B, 106A&B) includes: a self-oscillating, series-resonant oscillator (196, 198, 178, 180) producing a high-frequency output voltage for application to the lamps; a resistive-capacitive divider (190, 192) for starting-up the oscillator after a first delay; an inductive voltage boost IC (144) for causing the oscillator to produce a boosted output voltage when the voltage boost IC is activated and an unboosted output voltage when unactivated; and a resistive-capacitive divider (170, 172) for starting-up the voltage boost IC after a second delay.
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