I think you are right, but there was some chatter back in the day about converting the cones to flat/P3 tops to avoid the weird gap on the original tubes if you wanted a 22mm tank. I was still a newbie back then, so I may be mis-remembering things. There was a Ti P3 in the classies, but I don't think it would do 45W.BTW, pretty sure all provaris take flat top batts after V2. But I could be wrong.