A very generous member of this Forum gave me a B&K 415 and a 1077B along with most of the cables. I wanted to use the 415 to align this set and after making up the missing cable and converting the mic connectors to BNC, I found out that the 415 doesn't work on the "sweep" function. So over the next week I'll dive into that to see if I can get it going. I'll make a post in the Test Equipment section when that happens.