Tung-Sol 12BK5 Vacuum Tube NOS NIB Type Number They tested 8

They tested 8

(New / nominal transconductance is within one standard deviation of 1900

D getter and a 4-09 188-5 date / provenance code

New 12AU7s typically test within a standard deviation of 17/17 for gain

Tung-Sol 12BK5 Vacuum Tube NOS NIB Type Number They tested 8This new old stock, new in box Tung Sol 12BK5 and several others just like it tested to spec on our Paul Hart calibrated TV7 U. Three of these tubes are available initially in this Dutch Auction. Etsy will indicate how many are available. 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