6 Sylvania Type / Number 58 #58 Vacuum Tubes Engraved Stamped Base Lot Of Six Martin-In-The-Fields gas and transconductance on our

gas and transconductance on our Paul Hart-calibrated TV7/U and measured as follows:

new in box matched pair of GE-MANUFACTURED 12SL7 / 12SL7GT dual triodes was tested on our Pau Hart-calibrated TV7/U for shorts

I am playing them in my Mini Mite 2013 and they sound great

It sounds fair to middlin'

new in box GE 10JA5 tubes tested to spec on our Paul Hart-calibrated TV7/U

6 Sylvania Type / Number 58 #58 Vacuum Tubes Engraved Stamped Base Lot Of Six Martin-In-The-Fields gas and transconductance on ourThis lot of six Sylvania number type 58 stamped engraved base tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they measured as follows: 27, 35, 37, 44, 52 and 59 respectively, where minimum (65%) is 36 and 100% is 55. 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