Why are metal tubes suddenly valuable?

[kd4e]

I am told that metal 6V6 6F6 1613 1621 & 1611 tubes
are in great demand "overseas".  Anyone know why that
might be?

Another Ham told me at a recent Fest that he is gathering
and holding on to metal tubes as they are valuable but
would not disclose why - I guessed that the audio-fanatics
have bought-into some new fad but don't have an answer.

Inquiring minds want to know!  :-)

-- 

Thanks! & 73, doc, KD4E
Personal: http://bibleseven.com/kd4e.html

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