6550 tung sol type 2 4th gen halo getter three hole matched quad usa tubes

6550 tung sol type 2 4th gen halo getter three hole matched quad usa tubes

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Tung Sol for RCA 6550 Vacuum Tube Date 66-22 1966 3 Hole Grey Plates USED -FT248

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6550-TK Black Diamond Series Vacuum Tube Matched Quad

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VACUUM TUBES - 6550 RUSSIAN TUNG-SOL - FACTORY MATCHED PAIR - TRACED/TESTED! #2

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Date Matched Pair of Tung-Sol 6550 Vacuum Tubes Strong Testing!

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