[462ron]

David, just to reinforce what Rod mentioned about dangerous potentials on those speaker wires, it reminds me of a time in my teens. I was just getting interested in electronics and being a dumb kid messing around with an old radio a friend and I found at the curb back in the 60s. I really had no business doing what we did, a little knowledge can be dangerous  we pulled the chassis and speaker from the cabinet and put it on a table. We had it turned on and my friend had his arm laying across the speaker while at the same time went and tried turning up the volume by grasping the bare metal volume control shaft. Well it picked him up and threw him up against the wall. Now in hind sight I know why. His arm was in contact with one of the DC high voltage terminals on the speaker and when he touched the metal control shaft which was at B-, he was hit with fully around 300V, luckily he wasn’t electrocuted! Dangerous stuff for a couple of wet behind the ears kids!

Ron