That phase control, though with only a single SCR, and a half wave rectified mains input, was used by the millions in the most popular original Phillips TV chassis designs, and also carried on into the 1990's in a good number of sets, though with now having a bridge rectifier before it to stop the main issue of a half wave rectifier, DC current flow in the mains.
Phillips G11, which did, because they were all wired with a UK plug from the factory, so thus all had exactly the same DC current flow, cause quite a few older distribution transformers in residential areas to catch fire, because of the hundreds of TV sets all contributing to DC current saturating the transformer core, and the losses in the core rising to massive levels, till the oil expulsion from heat either blew all the oil out, and the transformer burnt out, or it blew the distribution fuses. Average power use of 300W, which was done with an 11A current pulse on roughly every second mains cycle, and which also caused UK grid massive harmonic problems.