Qty 3 tubes, RCA 6SN7GT NOS NIB NEW USA featuring design of rare SMOKE GLASS, silver label, black plates. Estimate vintage as 1950s. This design is among the best 6SN7 ever made. Test results -- each tube tests strong, uniform, and well-balanced: Tube #1 "1-13":
Tube #2 "222":
Tube #3 "213":
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[INV11]