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

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

This trio of Toshiba output tubes was tested on our Maxi-Matcher in Real World Conditions with 400 volts on the plates and a bias of -36 volts for shorts

3 rather than 12

Raytheon CK1122 Raysistor Control Circuit

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