I've been hoping for a long time to build a reasonably high power balanced ATU from scratch, and at last managed to pick up a lovely matched pair of roller-coaster inductors at Newbury Rally. They came out of a military auto ATU, and cost £20! I wanted a balanced ATU to match my 128' doublet...
As some of you may know, I recently acquired an HF linear and needless to say I've been putting it through its paces recently! I have a doublet antenna and use an MFJ-974H balanced tuner. The problem came when the other morning I tried to tune up on 80m, and at 100W there was a lot of fizzin' and poppin...