RCA Black Plate 6189 JANCRC12AU7WA 12AU7 ECC82 Vacuum Tube Triple 3 Mica Industrial / Milspec For Your Univalve Or Bottlehead

RCA Black Plate 6189 JANCRC12AU7WA 12AU7 ECC82 Vacuum Tube Triple 3 Mica Industrial / Milspec For Your Univalve Or BottleheadThis milspec industrial grade RCA black plate 6189 JAN CRC 12AU7WA 12AU7 dual triode was tested on our Maxi Preamp II for shorts, gas, dynamic range, transconductance and gain. There were no shorts, noise or gas and it tested as follows: Dynamic Range: 85. 7 dB 84. 8 dB ( 92 dB is the Maxi Matcher's noise floor) Transconductance: 1492 1460 (New is approximately 1450) Gain (Mu (): 16 16. 7 (New is approximately 17) This tube has 21 MM black plates; two

new in box GE 6DX8 / ECL84 tube tested to spec on our Paul Hart-calibrated TV7/U

most likely

new in box Cunningham 35/51 tube tested to spec on our Paul Hart-calibrated TV7/U

It measured a perfectly-balanced 51/51 where minimum (65%) is 40/40 and 100% is 62/62

new in box Telefunken-MANUFACTURED

They measured 29 and 31 where minimum (65%) is 22 and 100% is 40

perfectly-balanced Mullard EZ80 / 6V4 rectifier tube was tested on our Paul Hart-calibrated TV7/U for shorts

This Sylvania 6CA4 / EZ81 rectifier tube was tested on our Paul Hart-calibrated TV7/U

They measured (from left to right) 36

old-fashioned Coke bottle

It tested an outstanding 3000 micromhos with a plate current draw of 30

(New US-made 6V6s typically test with plate current from the mid teens to mid 30s with transconductance from 1700 micromhos or so