Doing my first bit of tube rolling on the VTL S400 amplifier. I replaced the stock JJ electronics 12AT7 with Gold Lion 12AT7’s. This means that the entire amplifier with the exception of the (2) Electro Harmonix 12BH7 tubes, are all Gold Lion reissued. I’ve been told that GL 12AT7 tubes are significantly better than the JJ’s. I will report back after 50-100 hours have put on them.