Matched Pair Groove Tube Fat Tone Premium 6V6 6V6S Uncle Doug Vacuum Tubes NOS-Testing 35L6 T25 It has a banded

It has a banded

Both are acid-etched

This Continental Electric JAN-C1K appears new

This Sylvania 5V4GA rectifier tube tested 55/55 on our Paul Hart-calibrated TV7/U where minimum (65%) is 40/40

2 milliamps' plate current

Matched Pair Groove Tube Fat Tone Premium 6V6 6V6S Uncle Doug Vacuum Tubes NOS-Testing 35L6 T25 It has a bandedThis matched pair of Groove Tube Fat Tone 6V6 S 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 30 milliamps with a transconductance of 3350 micromhos while Tube Two measured 34. 4 3500. (New US made 6V6s typically test with plate current from the mid teens to mid 30s with transconductance from 2300 micromhos or so.) These tubes