Chris, These tubes are mostly good for use in some old junk TV, or for weird experiments. For a tube coil, it's best to use transmitting tubes, or industrial power tubes. Happy (tube) coiling, John Freau ---- In a message dated 99-04-17 05:05:05 EDT, you write: << > Can anyone tell me if any of these tubes can be of any use in a tube > coil!! > 35Z5GT > 50L6GT > 12SA7 >> snipppp