Interesting use of them valves/tubes

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Rotelman

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Hey Guys,

I know just enough of valves/tubes to be adequately dangerous, but keen to learn from the specialists here. All in good time.

I saw this in a museum recently. It's a vintage metal-detector with what seems to be a amplifier board, possibly for the amplification/processing of the audible sound the metal-detector made ?

Thought the application of these were just brilliant.


sWqMXCN.jpg

 

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