[OFF TOPIC] I didn't want to start a new thread just to brag. I purchased a set of Westinghouse 7591's from 1966, put them in my 500-C, and OMG ! The clarity and fullness is amazing. They made my AR-2Ax speakers come alive, shooting out frequencies, especially in the high register, that they never had before. I also tried some old Sylvania's that were really nice, but I am sticking with the Westinghouse. Brag over.