Silvertone 5Y3 5Y3GT Vacuum Tube Rectifier Black Plate 12Q7 Octal Transconductance measured 49/50 for Tube

Transconductance measured 49/50 for Tube One and 50/50 for Tube Two (RCA-LABELED)

They are dead quiet when the CD player is paused (I have no preamp) and have excellent frequency response

A seven out of ten

Tube One tested 40 in Section One and 44 in Section Two

new in box Cunningham 14F7 tube tested to spec on our Paul Hart-calibrated TV7/U

Silvertone 5Y3 5Y3GT Vacuum Tube Rectifier Black Plate 12Q7 Octal Transconductance measured 49/50 for TubeThis Silvertone 5Y3GT black plate rectifier tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 58 56 where minimum (65%) is 40 40 and 100% is 62 62. This tube has a bottom D getter and an E9M date code which means it was likely made by Sylvania. Im playing it now in one of my Radio Craftsman RC 2 mono blocks and it sounds great. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES.