4 Sylvania 12SG7 Vacuum Tubes Valves Lot Of Four 5E514 5E-514 Transconductance measured 56/56 for Tube

Transconductance measured 56/56 for Tube One and 58/58 for Tube Two where minimum (65%) is 25/25 and 100% is 38

This paperback book is in good condition

They are microphonic and are fine in the preamp stage of my MP-301 and other gentle environments

I have played it (with an adapter) in one of my AC-heated Sound Craftsman RC2 amplifiers and it sounds great

an engraved base

4 Sylvania 12SG7 Vacuum Tubes Valves Lot Of Four 5E514 5E-514 Transconductance measured 56/56 for TubeThese four Sylvania 12SG7 tubes were tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Their readings are 44, 52, 54 and 66 where minimum (65%) is 42. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUR 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 OF THE TUBES