6 US-Made 6AQ5 Vacuum Tubes Black Glass Lot Of Six Nonal Bonus Tube This lot of three Sylvania

This lot of three Sylvania 12BR7 tubes tested to spec on our Paul Hart-calibrated TV7/U

6DJ8s are notoriously hard to test on most testers and Paul added ferrite rings to ameliorate this problem

These five Zenith 17JZ8 tubes tested to spec on our Paul Hart-calibrated TV7/U

These eight new old stock

These six 12BY7 / 12BY7A / 12BV7 tubes tested as follows on our Paul Hart-calibrated TV7/U where minimum (65%) is 46:

6 US-Made 6AQ5 Vacuum Tubes Black Glass Lot Of Six Nonal Bonus Tube This lot of three SylvaniaThis lot of six US made black glass 6AQ5 output tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 46, 52, 54, 57, 58 and 72 where minimum (65%) is 46 and 100% is 71. It took two adapters but was worth it as all six sounded fine in my Mini 2013. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE