7 US-Made 6B7 Vacuum Tubes Lot Of Seven Donna Summer very-light-gray bottles and mk AAB

very-light-gray bottles and mk AAB and kg BCL date codes

new in box DuMont 6LU8 tube tested to spec on our Paul Hart-calibrated TV7/U

6/1980 where new 6F6s measure from approximately 2000 micromhos with plate current draw in the 20s

This lot of three US-made 6AC7 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

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

7 US-Made 6B7 Vacuum Tubes Lot Of Seven Donna Summer very-light-gray bottles and mk AABThese seven US made 6B7 tubes tested as follows on our Paul Hart calibrated TV7 U: Triode Sections: 25, 32, 32, 34, 34, 34 and 38 where minimum (65%) is and 100% is . Rectifier sections: 28 48, 15 36, 54 54, 48 45, 40 62, 36 34 and 60 52, respectively. 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