Psvane tubes are manufactured in the same factories as Sino and Shuguang which have had a well-known dubious reputation for consistency. Theres that but tube vendors generally buy in lots, do a 24-hour burn-in to screen out early failures before stocking them and then add on noise testing and matching services at customer's request when ordering. I assume the initial failures are returned to the supplier, crashed down and discarded or sold to a less scrupulous dealers to be rescreened etc., and sold to less discriminating consumers. I would say selecting tubes from vendors like the Tube Store, Viva Tubes or The Tube Depot and the like who bet on their reputation to stay in business is a mark of good consumerism.
@calieng It seems to me that if you couldn't figure out a way to safely smash a tube without getting glass shards all over the place you probably can't test one correctly either.