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Original Message
RE: RCA 5691 Vacuum Tube
Posted by tube wrangler on July 24, 2021 at 09:02:51:
The 5691 and 5692 are RCA military tubes-- 5691 is a
6SL7 AND 5692 is a 6SN7.
While these are a solid lasting tube, they
don't perform in audio very well.
The later RCA and G.E. models that are all
glass, with only a thin wafer as the base,
greatly outperform the Mil-Spec variety.
-Dennis-