Serious Warning About Pentodes

We just got in a shipment of  6Ж32П (aka EF86) tubes. They came packed in a new kind of tube box I hadn't seen before. It does seem to bear a stern warning about its contents.

The Surgeon General recommends directly heated triodes...
 

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Josh has volunteered to let us know whether the Marlboro or Camel branded tubes sound better.
 
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