5691 JAN / CRC = RCA "Super 6SL7GT " NOS-NIB
The 5691 RCA Red Base is the Holy Grail of 6SL7 tube types. This tube is rich and melodic with an overall smoothness that can't be beat. Take this chance to own the best 6SL7 variant on the planet. All are RCA *made* Red Base 5691.
The RCA ''Special Red Tubes'' high-mu twin triode, 5691; are for industrial applications where 10 000-hour life, rigid construction, uniformity, and stability are paramount.
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