I'm asking because I just picked one up for cheap and its all original with no problems. Its the hermosa 150s, I believe its 75w rms by two into 4 ohms and about 150w by two into 2 ohms. The outputs appear to be tip 35 and 36c's and there are four per channel which seems sufficient for 150w per channel and each side of the power rail is almost 50vdc. I can't tell if the power supply uses fets or regular transistors though. Back in 91 I had a malibu 100 back when I lived in cali. and it was ok, but don't remember being too impressed with it although it never had a problem even when I ran it at 2 ohm mono a few times (just seeing what it could do ) The circuit design is very simple on the power supply and audio stages as well, except for a couple of very tiny ic's in the stage between the input and output drivers. They appear to have six legs and look like something out of a fosgate or newer sony amp. Anyone have opinions on these amps? I know they are a cheap brand but they seem to be built reliably. Remember back when they were selling component sets and those clean looking and nice sounding bandpass boxes??