Sylvania 5933 807W FU7 Vacuum Tube 13GB5 Plate Cap I am playing them now

I am playing them now in my Radio Craftsman RC-2 mono blocks with Pink Floyd's "Obscured By Clouds" and they sound terrific

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

It measured 73 where minimum (65%) is 50 and 100% is 77

new in box GE 33GY7A tubes tested to spec on our Paul Hart-calibrated TV7/U

gray plates and bottom

Sylvania 5933 807W FU7 Vacuum Tube 13GB5 Plate Cap I am playing them nowThis Sylvania 5933 807W FU7 output tube was tested on our Maxi Matcher 2 for shorts, gas and transconductance with 400 volts on the plates and a bias of 48 volts. There were no shorts or gas. Plate current draw was 17. 2 milliamps while transconductance measured 2050 micromhos. (New 5933s typically test from the mid teens to mid 30s with transconductance from 2200 micromhos). I am playing it now in my Musical Paradise 301 MK 3 (with an adapter, not