My lavatube seems to be malfunctioning. It will fire a 1.7 ohm carto fine, but will not fire my 3.0 ohm atty at any voltage. Tried lifting the center post on the connector, checked it with a ohms meter (it read fine) and checked the unloaded voltage of the lavatube (came up normal). Might have to send it in. Nows a chance to see how well that 1 year warranty works.