3 Sylvania 12AZ7 12AZ7A Vacuum Tubes Valves NOS NIB Lot Of Three 12AU7A They have black T plates

They have black T plates

new in box milspec / industrial RCA 6AB7 / JAN-CRC-6AB7 / VT-176 / 1853 tubes tested to spec on our Paul Hart-calibrated TV7/U

Sorry I cannot say how they sound

They have 2-30 188-5 and 3-52 188-5 date/provenance codes

This new old stock-testing matched pair of 1960s vintage Sylvania Fat Boy EL34 / 6CA7 tubes was tested on our Maxi-Matcher 2 tube tester with 400 volts on the plates and a bias of -36 volts on the grids for shorts

3 Sylvania 12AZ7 12AZ7A Vacuum Tubes Valves NOS NIB Lot Of Three 12AU7A They have black T platesThese three new old stock, new in box Sylvania 12AZ7 12AZ7A tubes tested to spec on our Paul Hart calibrated TV7 U. One is a 12AZ7 while the other two are 12AZ7As. 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