Sylvania 6L6 6L6GC Vacuum Tube Valve For Your Univalve NOS-Testing 6CG7 Westinghouse These two photomultiplier tubes could

These two photomultiplier tubes could not be tested and are sold as-is

Transconductance was 1240 for Tube One and 1380 for Tube Two where new/nominal is within one standard deviation of 1900

I have played it in my Musical Paradise 301 MK 3 and it sounds excellent -- airy with excellent dynamics and signal bandwidth

These new old stock

new in box matched pair of JJ low noise 12AX7 / ECC83 / 12AU7 dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Sylvania 6L6 6L6GC Vacuum Tube Valve For Your Univalve NOS-Testing 6CG7 Westinghouse These two photomultiplier tubes couldThis new old stock testing Sylvania 6L6GC was tested on our Maxi Matcher 2 for shorts, plate current, transconductance and gas. There was no gas. It tested an outstanding 3000 micromhos with a plate current draw of 30. 9 milliamps where new 6L6GCs typically test with plate current from the low 20s to mid 30s and transconductance from 2200 micromhos or so. It has dual O getters; a crenelated, top mica spacer and a bottom, smooth mica spacer and