Are you saying that tubes purchased from Vintage Tube Services (Andy), Brent Jessee, or Kevin Deal (Upscale) that are listed as NOS are used? The first two may carry tubes that have been used but will always say so and will tell you whether they test as new or not.
Of the two choices you list, I preferred the New Sensor "Genalex" Gold Lion. But that is just my taste given a forced choice between the two. My experience has been the NOS last a helluva lot longer than current production and that's based on both small signal and output tubes. There are some times when you get what you pay for. Just my 2ยข naturally.
Of the two choices you list, I preferred the New Sensor "Genalex" Gold Lion. But that is just my taste given a forced choice between the two. My experience has been the NOS last a helluva lot longer than current production and that's based on both small signal and output tubes. There are some times when you get what you pay for. Just my 2ยข naturally.