Hitachi 12AU7 ECC82 Vacuum Tube Valve NOS NIB For Your Bottlehead Or Univalve Triple Tested 76 Seventysix

Hitachi 12AU7 ECC82 Vacuum Tube Valve NOS NIB For Your Bottlehead Or Univalve Triple Tested 76 SeventysixThis 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

This lot of three new old stock

Date Codes: LE1 and LE4

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

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

(New 6SN7s typically test within a standard deviation of 2600 micromhos

2 hertz vibrasender / vibrasponder appears fresh and new

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

This industrial-grade GE 6679 / 12AT7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

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

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

29/26 and 52/46

This new in box JJ 6BQ5 was tested on our Maxi-Matcher with 325 volts on the plates and a bias of -14 volts for shorts