My question - Within reasonable certainty, is this tube is NOS or is it USED?
@inagroove Just look at the pins of the tubes. If you see scrapes along them the tube has been inserted into sockets a few times. An NOS tube will have no scrapes.
For Tube Folks...
Hi All,
I am rather new to tube gear and recently purchased a 'NOS' GE 6550 Power Tube.
A. It was advertised as: "New old stock in original or OEM box. A nice USA tube that will outperform any current production 6550 made. An excellent lot, matched to within 5 percent and then aged in a hi-fi shop demo unit. Very low hours, burn-in time only, and the performance has been verified by us..."
B. The seller also sells used GE6550 tubes that are advertised as: "Light use, tested good with good match, and white box..."
The large black spot on the glass where it GE is etched makes wonder how many hours of usage this tube has seen...
My question - Within reasonable certainty, is this tube is NOS or is it USED?
Thanks in advance for any clarity.