Sylvania 5933 807W FU7 Vacuum Tube Sylvania 5347 These tubes have steel support

These tubes have steel support rods and copper support rods for their harp-shaped getters

Transconductance measured a perfectly-balanced 2700/2700 micromhos

new in box Silvertone 6LJ8 tube tested to spec on our Paul Hart-calibrated TV7/U

This pressing has lightl surface noise audible in quiet passages and barely-audible in voice-level passages

pre-oil-embargo pressing and it sounds very good

Sylvania 5933 807W FU7 Vacuum Tube Sylvania 5347 These tubes have steel supportThis 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