yes they did, but they aren't the one one. currently, Rocktron's Silver Dragon also has a back-lit LED to light up its integrated pre-amp tube. this came about because players were expecting the tube to light up upon the pedal's activation but this isn't the case as the pedal is running on 12V power, unlike the power it receives in an actual amp... however, this doesn't mean that the tube in there isn't working.
tube hoax? it's up to you to try & hear if the tonal difference has something for you. in the mean time, i'm enjoying the tube swap... :supz: