RCA Black Plate 6189 JANCRC12AU7WA 12AU7 ECC82 Vacuum Tube Triple 3 Mica Industrial / Milspec For Your Univalve Or Bottlehead March 03 2025 Otherwise it is sold as-is

Otherwise it is sold as-is with no returns

There are eight new old stock

It is also autographed by Mr

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

new in box RCA 6JU8A tubes tested to spec on our Paul Hart-calibrated TV7/U

RCA Black Plate 6189 JANCRC12AU7WA 12AU7 ECC82 Vacuum Tube Triple 3 Mica Industrial / Milspec For Your Univalve Or Bottlehead March 03 2025 Otherwise it is sold as-isThis 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