Subject: Re: Primaries and Copper Tubing Date: Thu, 24 Apr 1997 17:01:00 -0700 (PDT) From: "Edward V. Phillips" <ed-at-alumni.caltech.edu> To: tesla-at-pupman-dot-com "I do not know what the crit. heat is for copper, but the controlled cooling is just as important as reaching that temp for ideal annealing." Not so in my experience. Quenching works just as well as slow cooling, and has the advantage of flaking off the scale. Ed