NessTone Premium Grade EL34. Beautiful, warm British tone from this EL34 tube. Perfect for your Marshall, Orange, Blackstar, Bogner, Dr Z KT45, Hiwatt, Laney, Mesa Boogie, Rivera, Voodoo, Vox Ac100 and many others. They are fully computer tested using the Roetest professional system and the famous TV-7D/U. Pairs, quads and sextets are tightly matched using the latest Maxi-Matcher 2 professional matching equipment.