Old Sony Trinitron

[kx250rider]

Originally Posted by ChrisW6ATV

If I remember right, when I fixed an early 12" Sony color TV, I hed to buy real replacement transistors from Sony to get it to work right. I tried two sets of subs as listed in the Photofact manual or other substitution book, and they either failed or had a fold problem.

That's true with some of them, particularly the SG-613 SCR, which was used as the horizontal output all through the 70s, and also as the regulator chopper in a few models (KV-1722, and ilk). That was a $60 part last time I checked, and I don't think you can even get them from Sony anymore. None of the ECG or other aftermarket ones worked. Same goes for the 2SC4834MN, which is the power supply regulator (pair) in the early 90s Sonys. The aftermarket ones fail right away. But for most of the other transistors in the early Sonys, fakes are fine.

Charles