The frequency involved when it didn't light was around 90 Khz, the tube had been running ok for over 1/2 hour so it was quite warm, and it was running under the Spooky Plasma preset in the February software release. Penny Yu March 30, 2016 09:54 Follow SC is designed to run at 100 kHz minimum. It may be why there is a problem. Have more questions? Submit a request 0 Comments Please sign in to leave a comment.