Sylvania 5Y3 5Y3GT Vacuum Tube Rectifier Black Plate Pental Grid Cap This trio of US-made 6X4

This trio of US-made 6X4 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

It is a strange bird with well over an inch of space above the top mica spacer

FOR EXAMPLE

This lot of four of GE black plate 6CL6 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

Sylvania 5Y3 5Y3GT Vacuum Tube Rectifier Black Plate Pental Grid Cap This trio of US-made 6X4This Sylvania 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 54 53 where minimum (65%) is 40 40 and 100% is 62 62. This tube has a top D getter, short base; massive plates and an EG MHT date code. 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. IF IT'S NOT