This control is from the Motorola Circuit Applications for the Triac of 1971. The Triacs can be equivalent according to the heater power and the pulse transformer has a 1: 1 turn ratio in the 3 windings. The unijunction can be the 2N2646 and the bridge diodes 1N4004 for the 110 V power grid. For the 220 V network use 1N4007 and increase R1 to 22k x 2 W.
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