Hitachi 12AU7 ECC82 Vacuum Tube Valve NOS NIB For Your Bottlehead Or Univalve Triple Tested 76 Seventysix The Superior-tested tube measured "low

The Superior-tested tube measured "low to medium-good

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

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

they can put out as much as 2A3s and fell into disfavor because of socket supply issues

This lot of three new old stock

Hitachi 12AU7 ECC82 Vacuum Tube Valve NOS NIB For Your Bottlehead Or Univalve Triple Tested 76 Seventysix The Superior-tested tube measured "lowThis 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