Matched Pair Telefunken 6BQ5 EL84 Tubes - round getters. Tubes are labeled for a Harman Kardon amp. Both have “Made in Western Germany” printed on the tubes and also have the diamond stamped on the bottom of the tubes. The tubes have been tested on my professionally-calibrated Hickok 539B tube tester. Minimum transconductance for a good 6BQ5 EL84 tube is 5650 umhos and a new EL84 tests around 10000 - 11000 umhos. Transconductance values are written on the lower side of each tube (away from screen printing) with removable Sharpie pen. Transconductance values are: 9000, 8200 umhos, which is very strong and is a match within 9%.