Todays WTF : these things are out of a Threshold 400A "cascode class A" amp (I would have called it Cork Sniffer - it has more than a hint of Nelson Pass kitset about it. Anyhoo, it is seriously munted in the silicon dept and uses these as outputs and the 3 (out of 8) survivors in one of the banks has insane Hfe (150ish) - they are not darlingtons. Conversely, the forest of MPSA42/92 doing driver duty have around Hfe 40 or less (all the new ones in my parts bin are well north of 100. Anyone know what a "CLASSA8" is or doesn't it really matter and I can chuck some MJ15024s in there.
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