Black Plate Tung Sol 6550, branded as Tung Sol, Sylvania, Magnavox, and RCA these “coke bottle” shape 6550 with solid black plates are the creme de la creme of 6550’s. Matched very tightly, these are extremely hard to come by! A few singles available with broken guide pins. $799.99 per tube. Please email or contact us for matching availability
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