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Sony color trinitron sets made in the 80s that used the SG613 switching triac (or what ever the device was called). One little problem, like a bad connection in the horizontal or in the power supply, or a bad cap, etc, and poof, both of them would short out. Spend a bunch of money on new ones, solder them in, and thinking you've got all the problems taken care of, and then you plug it in and again, poof, another $40 or more bucks down the drain. And besides that, only the exact original Sony SG613s would work. Some other manufacturers (including ECG) made copies of them, and if they worked at all, they only lasted for at the most a month or two. Most TV repair guys tried to avoid those sets like the plague. I had one here that was working beautiful, and then it lost the picture due to an open transformer providing filament voltage to the CRT. Disconnected the leads to the filament and supplied filament voltage from an external supply, and had a great picture. Tilted the boards back into place, and a connection or something either shorted or broke loose, and yes, poof, the SG613s were history. Never the less the set got junked out.
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