This is a matched quad of Telefunken 12AU7/ECC82 Tubes. I have listed them as used because I'm not sure of their history, they could be new. I just found them. I had put them away for a customer in December of 2018, they never compleated the order and here we are. All of the tubes will come in white boxes. I don't have original boxes, that is why I'm listing them as used. The tubes were tested properly on our calibrated TV-7D/U. Minimum is 51. B&K 707 new =2200 B&K Below Tube 1 Has Grey ribbed plates and a date code of "MH" 12/1957 Triode 1 = 120 Triode 2 = 120 1=2300 2=2200 Tube 2 Has Grey Smooth Plates and a date code of "CN" 12/1961 Triode 1 = 120 Triode 2 = 120 1=2300 2=2250 Tube 3 Has Grey Smooth Plates and a date code of " TF" 7/1959 Triode 1 = 120 Triode 2 = 120 1=2150 2=2200 Tube 4 has Grey Smooth Plates the date code is worn "F?" Triode 1= 120 Triode 2 =120 1=2200 2=2150 All 4 tubes have Telefunken diamonds in the bases between the tubes. Nice straight pins... I questioned how well the tubes matched and warmed them up again and re-tested them with the exact results. I then tested them in our BK 707 with similar results. The B&K is not as precise. Your tubes will be packed and shipped properly.
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