John, thanks for the info and the link!---Oh and the mental headach too!---there is no end to the learning curve! aluminium or tin or copper ???? Black Cat or Orange Drop? But the web site had a lot to read up on so it's back to the books! Nevertheless, I think this is what makes this "hobby" so very addicting! I thought I was obcessing a bit but then I read your comment---not one pair but 2? What? a back up just incase? Earthquakes, natural disasters?--How many moonpies ya got in that icebox bud? Me, I only have 9 amps---and I justify them that it's the only way I can tune my ears ! thanks more questions later Jim