RCA 12K8 12K8Y Vacuum Tube Valve NOS NIB 12SL7GT Black Plate They are dead quiet when

They are dead quiet when the preamp is muted and have excellent frequency response

This RCA 6L6GC output tube was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts

new in box 956 tubes tested to spec on our Paul Hart-calibrated TV7/U

Listening report to follow

new in box RCA RCA 3AT2 / 3AT2B / 3AW2 tubes tested to spec on our Paul Hart-calibrated TV7/U

RCA 12K8 12K8Y Vacuum Tube Valve NOS NIB 12SL7GT Black Plate They are dead quiet whenThis new old stock, new in box RCA 12K8Y tube and another just like it tested to spec on Paul Hart calibrated TV7 U. Etsy will indicate how many are available as the listing progresses. . 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