Turn Up Amplifier. A Rotary Knob Is Turned Right And Left To Control Signal Multiplier Amplification Factor On A Piece Of Vintage Electronic Oscillograph Oscilloscope Test Equipment From Right Side Angle
ID 344404202 © Jeffdennis | Megapixl.com
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adjust analog antique broadcast button bygone classic communication control device dial electrical electronic energize engage engineer equipment era fingers function hand hardware indicator knob lab light military move nostalgic old operator power radio receive retro rotate set signal station switch technician technology test transmit tune turn vintage volume
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