RCA Black Plate 6189 JANCRC12AU7WA 12AU7 ECC82 Vacuum Tube Triple 3 Mica Industrial / Milspec For Your Univalve Or Bottlehead March 03 2025 This matched pair of Ken-Rad-MANUFACTURED

This matched pair of Ken-Rad-MANUFACTURED 6K6 6K6GT tubes was tested on our Maxi Matcher 2 with 325 volts on the plates and a bias of -36 volts for shorts

and if it is

" AND YOU HAVE NOT ACTUALLY RECEIVED IT

gray bottle type / number 41 tubes tested as follows on our Paul Hart-calibrated TV7/U:

Otherwise it is sold as-is with no returns

RCA Black Plate 6189 JANCRC12AU7WA 12AU7 ECC82 Vacuum Tube Triple 3 Mica Industrial / Milspec For Your Univalve Or Bottlehead March 03 2025 This matched pair of Ken-Rad-MANUFACTUREDThis 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