For Macro Mondays theme "technology". This is one of the vacuum tubes (or valves for thos on the other side of the water) in a guitar amp, taken at night so the glow of the filament can be seen.

Posted by cold_penguin1952 on 2015-05-25 03:00:39

Tagged: , vacuumtube , amp , guitaramp , Macro Mondays , technology

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