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File:Vintage RCA Blackplate 6L6GC Vacuum Tubes Made For McIntosh, Made In USA (15643635699).jpg - Wikimedia Commons
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More thoughts on the RCA 6LCGC Black Plate and GE 6L6GC Grey Plate Vacuum Tubes - Jeff's Place
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QUAD RCA 6l6GC Black Plate Single Side Getter form early 1960s
More thoughts on the RCA 6LCGC Black Plate and GE 6L6GC Grey Plate Vacuum Tubes - Jeff's Place
RCA 6l6GC Blackplate Valve Tubes Vintage Tube Matched Pair Duet Black Plate
