Sylvania JAN-CHS-5933 5933 807W FU7 Milspec Vacuum Tube NOS-Testing Jazz Piano Columbia new in box and tested

new in box and tested to spec on our Paul Hart-calibrated TV7/U

They have chamfered top O getters

Tube One measured 30 while Tube Two measured 32 where minimum (65%) is 22 and 100% is 49

Raytheon CK1122 Raysistor Control Circuit

This lot of six GE 6AC7s was tested on our Paul Hart-calibrated TV7/U for shorts

Sylvania JAN-CHS-5933 5933 807W FU7 Milspec Vacuum Tube NOS-Testing Jazz Piano Columbia new in box and testedThis new old stock TESTING milspec Sylvania JAN CHS 5933 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 52. 7 milliamps while transconductance measured 2910 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