Sylvania 5933 807W FU7 Vacuum Tube Sylvania 5347 pre-oil-embargo pressing and it sounds

pre-oil-embargo pressing and it sounds very good

new in box RCA 6CB6A / 6CF6 tubes tested to spec on our Paul Hart-calibrated TV7/U

top to bottom): 42/34

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

There were no shorts or gas and it measured a perfectly-balanced 41/41 where minimum (65%) is 32/32 and 100% is 49/49

Sylvania 5933 807W FU7 Vacuum Tube Sylvania 5347 pre-oil-embargo pressing and it soundsThis 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