They are original Type J's. I used them as primary speakers for about 30 years. They retired around 2010, and I recently replaced the tweeters and crossovers. I tried them with a mid 60's Scott Integrated tube amp, which just didn't have the power to adequately drive them. Now I've been using a 35 plus year old Luxman 3555 receiver, but one channel has died, thus the need to replace. As you can see, when I fall in love, I stay in love! I don't follow audio closely unless I'm pondering a change, so all suggestions are really helpful and welcomed.