Hitachi 12AU7 ECC82 Vacuum Tube Valve NOS NIB For Your Bottlehead Or Univalve Triple Tested 76 Seventysix new in box 6SR7 tubes

new in box 6SR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box RCA 17AY3 / 17AY3A / 17BS3 / 17BS3A tubes tested to spec on our Paul Hart-calibrated TV7/U

29/26 and 52/46

Transconductance measured 49 for Tube One and 52 for Tube Two where minimum (65%) is 36 and 100% is 55

Hitachi 12AU7 ECC82 Vacuum Tube Valve NOS NIB For Your Bottlehead Or Univalve Triple Tested 76 Seventysix new in box 6SR7 tubesThis new old stock, new in box Hitachi 12AU7 ECC82 dual triode was tested on both our Paul Hart calibrated TV7 U as well as our Maxi Matcher Preamp Tube Tester. On the Maxi Matcher, it tested as follows: Dynamic Range: 77. 6 dB 82. 3 dB ( 92 dB is the Maxi Matcher's noise floor) Transconductance: 1410 1411 (New is approximately 1450) Gain (Mu (): 14. 6 15. 7 (New is approximately 17) On the TV7 U, it tested as follows: 79 77 where minimum (65%) is 50