vacuum tube 3: All modern vacuum tubes are based on the concept of the Audion--a heated

vacuum tube 3

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osmar01
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vacuum tube 3: All modern vacuum tubes are based on the concept of the Audion--a heated
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vacuum tube 3: All modern vacuum tubes are based on the concept of the Audion--a heated

February 13, 2016 wernerb

A journey into the past- the beginning of future... ;-) Thank's for sharing!

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Image properties
Dimensions: 4324px * 3089px
Published: February - 15 - 2013
Camera: Nikon D7000
Date: 2012:01:28 21:08:35
Aperture:f/6
Exposure: 1/25s
Focal length: 35mm
ISO: 100
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