As I am pretty familiar with STK hybrids, I figured I would throw in my 2 cents. While I don't totally trust "Clones" and the majority of hybrids for sale are clones, I have used some on occasions where I didn't have a good alternative. But I was lucky enough to have a friend who had a massive supply of Sanyo STK and Sanken hybrids in his warehouse since the 80's. He was a parts supplier to some of the major parts houses. So I was able to get a reasonable number of each of them as he was shutting down his business. But as expected, heavily used, and therefore most prone to failure chips like the STK0050, STK0100 etc were not to be found in the 17 cases of others, as they had been sold off years ago, either in bulk or as individuals. But he did have quite a few other similar types as in the STK1060, that is almost the same as the STK0060, which is a little heavier than the STK0050. The difference was that the STK1060 had 2 internal resistors. It is easy enough to bend up the 4 center pins of the STK1060, install it, and it will function as well if not better than the original STK0050.
What I am trying to get at is that sometimes subs are a better alternative to taking a chance with clones if the possibility exists.
I also know where the reaminder of the 17 cases went to and could tell people in a pm what and who to look for on the auction site as well as his original on-line site. This fellow has also sold to some of the US parts places, so some of the stock could have resurfaced. But sorry, as I said the STK0050 were not there.
A sad story was finding 3 or 4 cases of original Sanken S-80W Hybrids. Packed in protective Styrofoam sleeves at 20 per sleeve, and probably 8 sleeves per case, these sat in storage since the 80's. They were worth their weight in gold back them, but because the supply dried in in the late 80's I believe people just trashed the units due to lack of parts.
