3 Sylvania Number / Type 19 #19 Vacuum Tubes Lot Of Three For Your Bottlehead new in box US-made 9AU7

new in box US-made 9AU7 tubes tested to spec on our Paul Hart-calibrated TV7/U

It sounds very good with light surface noise and the occasional click and pop

This matched pair of new old stock

This GE-MANUFACTURED

3 Sylvania Number / Type 19 #19 Vacuum Tubes Lot Of Three For Your Bottlehead new in box US-made 9AU7This lot of three Sylvania MANUFACTURED number 19 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and emissions. There were no shorts or gas. They measured 28 30, 34 34 and 38 41 where minimum (65%) is 25 25 and 100% is 38 38. They have engraved hot stamped bases on is Champion branded and the other is Zenith. Their internal structures are all the same, though they are labeled differently. WE HAVE SCORES OF THOUSANDS OF VACUUM