Original poster: "David Trimmell by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davidt-at-pond-dot-net> Hi, I have just posted the 304TL schematic and pictures from Claude Masetto on my web site. See: http://192.168.1.202/webdoc2.htg/Tube_coil/304TL.htm Pretty good performance! Regards, David Trimmell www.ChaoticUniverse-dot-com