National Union NU 1N6 1N6G Vacuum Tube NOS NIB Stereo LP IM 37823 Transconductance measured 56/56 for Tube

Transconductance measured 56/56 for Tube One and 58/58 for Tube Two where minimum (65%) is 25/25 and 100% is 38

new in box Tung-Sol 6SD7GT pentode tested to spec on our Paul Hart-calibrated TV7/U

It is dead quiet when the preamp is muted and has excellent frequency response and dynamics even though it tests poorly

It was made in Germany

Detector and First Audio 12AV6

National Union NU 1N6 1N6G Vacuum Tube NOS NIB Stereo LP IM 37823 Transconductance measured 56/56 for TubeThis new old stock, new in box black plate National Union 1N6G tube tested to spec on our Paul Hart calibrated TV7 U. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT 202 372 6931 IF YOU DO NOT SEE WHAT YOU NEED OR HAVE ANY QUESTIONS. 1. MOST FORMS OF SHIPPING EXCEPT MEDIA MAIL ARE AUTOMATICALLY INSURED UP TO $100. ETSY PURCHASE PROTECTION