H03K4/00—Generating pulses having essentially a finite slope or stepped portions
H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
H03K4/12—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth voltage is produced across a capacitor
H03K4/16—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth voltage is produced across a capacitor using a single tube with positive feedback through transformer, e.g. blocking oscillator