I have a set of original 15's, not XR, which someone has painted black all over.. not that badly but not exactly professionally shall we say... (can't remember how/where I got them). I've never actually tried them and have removed the HF1300's for safe keeping. I'm pretty sure all drive units measured as correct resistance and the woofers were moving freely when pushed by fingers as were the ABR's when I checked. HF1300's measure correct resistance also but I don;t know if they are A1 or not. Seeing they were £55 in 1973 in an old hi fi mag I was reading the other day, and that this was about £620 in todays money, combined with happy memories of the 15XR's, has made me consider reuniting them with their tweeters, replacing the electrolytics, and giving them a go. HF1300's don't seem to age really... if they work they work. No doubt will sound shite and ruin my rose tinted memories
I googled the 15's a few days back and was interested to find that the 15XR's were not just the 15's with the new dome tweeter as I had assumed. They are completely different other than the general concept. 15XR's have slightly larger cabinets, new tweeter obviously but also completely new bass unit which is now pressed steel rather than cast alloy chassis, redesigned ABR and different values in crossover but still 1st order on bass and 2nd order on tweeter, same as Mission 770 FWIW.
