I have a MAC 4100 that I am trying to adjust bias on. I read the SM instructions for the procedure but would like to know precisely where I should be clipping my meter leads to to read the AC line current. I tried to read across the fuse holder with the fuse installed, but that only read 7 mA on my Fluke meter. Without the fuse installed the speaker relay would not energize. Mcintosh experts help would be greatly appreciated.