It never ceases to amuse me when I see a carton of N.O.S. military spec. tubes labelled ‘Fragile’. These tubes are good for 80,000 feet altitude (getting on the edge of space), 500G impact acceleration (equivalent to the ‘Blackbird’ spy plane hitting a mountain at mach 3) and immune to gamma radiation. What to they think the postal service are going to do to them!?