Motorola transistors

Thanks Cford. I had read that it was a direct swap but what you say makes me question it. I think I'll stick with what I got until it blows and based on the reputation of these power transistors, it should be a long long time...

. . . and actually newer, better, and more closely matched out of the box than the 15022/15023 is the ON Semi MJ21195 (PNP) and MJ21196 (NPN). Currently, I'm in the middle of totally rebuilding a Threshold Stasis 2 using these.

Lot's of good info in this area at http://www.diyaudio.com

. . . but you probabaly won't hear any big difference by changing output devices from one revision to another. The main thing is to make sure that the bias is correctly.