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In this video, we explore how to build a quasi continuous wave or QCW Tesla coil. These devices are technically challenging to build but well worth the effort. They are basically DRSSTC Tesla coils with a ramped voltage input and with much longer on times compared with traditional DRSSTC Tesla coils. The first QCW Tesla coils were built by Steve Ward and refined by others such as Loneoceans. The idea for building QCW coils came from observations that VTTC staccato controlled Tesla coils with unfiltered mains input produced beautiful long straight sword-like arcs.