Brian Roemmele
@BrianRoemmele
we can only see what we think is possible...
参加 January 2010
44.2K フォロー中 489.4K ファン
A vintage vacuum tube showing its internal structure. The large glass envelope maintains a vacuum to allow electron flow and prevents the intense heat of the internal filament from shattering the casing. It is an ideal early specimen.
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