using two tubes so coupled that the input of each one is derived from the output of the other, e.g. multivibrator

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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 two tubes so coupled that the input of each one is derived from the output of the other, e.g. multivibrator