Matched Quad General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Octal Metal Base OM 59 60 and 64 where

59 60 and 64 where minimum (65%) is 40

62/35 and 74/56 where minimum (65%) is 50/50 and 100% is 77/77

This lot of four Sylvania chrome dome 6K6GT tubes were tested on our Maxi Matcher 2 with 325 volts on the plates and a bias of -36 volts for shorts

well-defined bass and sparkling

They are a tad microphonic and are fine for home use

Matched Quad General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Octal Metal Base OM 59 60 and 64 whereThis matched quad of GE 6SN7GTB dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 56 56 for Tube One and 58 61 for Tube Two. Tubes Three and Four measured 58 61 and 60 62, respectively. (Minimum (65%) is 50 50.) They have horse shoe getters; copper support rods; great flashing and 60 13 188 5, 56 39 188 5, 59 13 188 5 and 57 26 188 5 date factory