[Amps] 811As

[Ian White GM3SEK]

Steve Thompson wrote:
>I've just received a bunch of Marshall 811As (for a friend
>who wanted spares for his 30L1). The boxes have what appears
>to be a radioactive warning symbol on them. If that's really
>what it is, can anyone tell me why?

Thoriated tungsten filaments? Thorium is very mildly radioactive, but 
individual tubes contain such tiny quantities that they should be exempt 
from regulations in all countries.

This seems like some confusion on the manufacturer's side. At the 
factory they probably handle enough thorium to require labeling and 
controls; but end users do not.


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73 from Ian G/GM3SEK