That RCA rig was a single-frequency affair and that circuit is a bitch to tune. I wouldn't touch it for ham use unless I wanted to park it on, say, 3885 kHz. Been there. - Jim WB6BLD >> An article describing a 90% efficient RF stage is posted on my >> webpage at: >> http://wc6w.50webs.com/wc6wamps/index.html?fr422.html