Sunday, October 22, 2006 Video: Mark Keppinger on theremins Posted By: Jason @ 22:31 A big thanks to Jeff S for helping us discover several videos of Mark Keppinger - the theremin builder extroidinare known for his incredible home-built tube theremins (and for listing them on eBay starting at just $1). Follow the discussion on this forum thread. Read More: DIY, Video View Comments (0) - Leave Comment - Permalink -