[Amps] Tough valves?

[R.Measures]

**  Probably the most rugged valves/tubes around are those with 
thoriated-tungsten mesh filaments.  Examples are the 8170R/4cx5000R, 
3cx1000A7, 4cx1500A, the 4cx10,000J, et cetera.    However, shipping such 
valves in a separate padded box is still a good idea since a valve that's 
dislodged from its socket can break a vacuum capacitor.

>I will be transmiiting with my valve amplifier from my summer cottage this 
>year which g me worried that transporting the amp (1xGU74) to and from my 
>home to the cottage might not be the best thing for the valve itself. But 
>then I see many DXpeditions use the same amp on many trips, so the 
>resilance o valves being bounced around in cars and planes must be quite 
>reasonable.
>
>So the question I have to the group is are (ceramic) designed to 
>faithfully stay in one place, or can the take the punishment of beig moved 
>happily around in the back of the car etc, and to what extend can they 
>take this?
>
>Richard
>SO5GB