Up until about 2 years ago like many my focus was on NOS tubes. I spent hundreds trying hundreds. Many great tunes were experienced but bottom line is now I've shifted my thinking simply due to what I'm hearing. Current production Asian made tubes are sounding great these days. I've read a lot about the Northern Electric tube history and current production. Honestly I'm not focused on country of origin I'm more focused on a great tune. This current production Northern Electric is very quiet, is well balanced tonally with extended frequencies. No other tube I've used has the detailing and that top end and the mids are way above average... Exceptional. I let my ears decide what's best and these are incredible great sounding tubes. I have run them in my ReVv Generator 7-40 and 1969 50 watt JMP. The TAD, short plate Millard and 4th Gen Shuguang are the only other tubes I can say I really enjoy and all are current production. Yes it's expensive but the resulting tones from the Northern Electric are stunning!