This is the Sovtek EL84 6BQ5 Matched Pair. The Sovtek EL84 series produce an unbeatable smooth, warm, distortion. Excellent replacements in vintage VOX AC-15’s and the like, Sovtek EL84’s are used by Fender, Crate, and Peavey.We have fully tested each valve for you and give a 120 day warranty. The Sovtek EL84  6BQ5 Matched Pair is tested by us with an anode voltage of 350 volts which is higher than most amps to give a good match at realistic amplifier voltages and to assure you of a good reliable product. You will receive a test certificate showing the results.