RCA 6SK7 Tube, NOS

RCA 6SK7 tube, new-old-stock, tested and graded. The box is labeled 'Standard Brand' but the tube inside is genuine RCA. Used in many vintage variable-mu tube compressors such as the RCA BA-6A. Also used in our "Hi-Fi Control Amp with Expression" project. Each tube is individually tested and quality verified before shipping.