It's amazing that one can find a forum for just about anything, including something as specific as a power amp head.
I've recently spent an inordinate amount of time finding a bass amp head for my younger brother as a Christmas gift. He was asking for an Orange head, but I immediately cringed at the cost of the model he was asking. After looking for some more budget friendly alternatives, I stumbled upon custom amp head at a mom and pop music store that had a B200s powering it. It's running a Peavy Max pre-amp, and it's in a beat up case that definitely looks homemade. It does look pretty awesome though, and I know he's into that beat-up road gear look. Anyway, it definitely caught my eye, and was within my budget, but I had no good way of testing the thing since I myself don't play bass, and I didn't want to use the store's nice equipment. The pre-amp did meet the requirements, and was a hybrid tube/solid state setup, so I rolled the dice and just bought the thing.
After getting home, I really wanted to try it out on his speaker cabinets with his own bass. He uses two large Peavy cabs, and I was concerned the B200 wouldn't be enough to power them both... Holy cow was I wrong. Even though his current head is rated at a slightly higher watt output, it's clearly not sending all the "umph", because this B200 unit was driving those speakers hard. I've never seen them visibly move, especially the floor sub. I could actually feel the thump in my chest from this thing. I feel if I crank it to max, it'll likely blow them...
It sounds considerably cleaner too, and I don't know if that's attributed to the B200 itself, or the pre-amp. Either way, I'm super happy, and hope he is too.
I don't really have a specific tech question, but was more curious about the thing itself. Like what year they were in production? Just something so I can give him some info on it. I can't find much about ADA in general, and even less on this model. This forum is about all I can find.