NOS means just what it says: New Old Stock.
How much you believe the tube is actually NOS depends on the tube.
NOS Mullard EL34? Maybe not.
NOS CBS Hytron 807? Good chance it is. And many rectifiers.
Just my opinion of course
How much you believe the tube is actually NOS depends on the tube.
NOS Mullard EL34? Maybe not.
NOS CBS Hytron 807? Good chance it is. And many rectifiers.
Just my opinion of course