Matched Pair General Electric GE 6V6 6V6GT Vacuum Tubes Black Glass Amperex 5915 NOS I have listened to it

I have listened to it in my Bottlehead Crack headphone amplifier and it sounded great

This National Union NU 2B7 tube tested to spec on our Paul Hart-calibrated TV7/U

Plate current draw was 32 and 32

sutured tops and a large D getter angled at 45 degrees

Transconductance measured 41

Matched Pair General Electric GE 6V6 6V6GT Vacuum Tubes Black Glass Amperex 5915 NOS I have listened to itThis new old stock testing matched pir of GE 6V6GT output tubes was tested on our Maxi Matcher 400 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas. Tube One drew 20. 3 milliamps with a transconductance of 2320 micromhos while Tube Two measured 21. 3 2520. (New US made 6V6s typically test with plate current from the mid teens to mid 30s with transconductance from 2300 micromhos or so.) These