Quote:
Originally Posted by walterbeers
Sony color trinitron sets made in the 80s that used the SG613 switching triac
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Um, they stopped using SG-613 and SG-264 Silicon Controlled Switches in 1978. After that, conventional transistor deflection with 2SC1116s and those funky TX-series transistors...
We had very little trouble with them - the trick was to replace the (leaky) SID30-15 (GH3F) diodes, and check all the sub-10K carbon resistors in the gate circuit for opens. You also had to check for a presence of the drive signal to the gate - some CX-numbered chip provided it, and without it, you'd eat the SG-613, as the SG-613 would be on all the time. Most of the sets we saw were lightning strike sets.
We bought SG-613's direct from Sony National parts, as they had improved the SG-613 to the SG613-A (marked with an A below the SG613). The ECG276 replacements were remarked non-improved SG-613s, and would fail with certainty.