RCA 12K8 12K8Y Vacuum Tube Valve NOS NIB 12SL7GT Black Plate a button/thimble getter and excellent

a button/thimble getter and excellent flashing

53 and 54 where minimum (65%) is 40 and 100% is 62

Transconductance measured 35

Tube One drew 30

They measured 95/81

RCA 12K8 12K8Y Vacuum Tube Valve NOS NIB 12SL7GT Black Plate a button/thimble getter and excellentThis 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