[Amps] Proper Storage of Spare Tubes?

[Jeff Maass]

Is there a proper orientation in which to place spares on the 
shelf for long-term storage? Upright? On side? Upside down?
Balanced on the corner of the box at 37.5-degree angle?
Some other orientation?

Tubes in question are 3CX800A7, 3CX1200A7, 4CX1600B, 
8874, 811, 4CX800A.

73,
     Jeff Maass  K8ND

     Caribbean Contesting Consortium - PJ2T
     http://asgard.kent.edu/ccc/signal.point.home.htm