In Reply to: RCA 5691 Red Base Tubes posted by geezerrocket on November 25, 2014 at 11:28:35:
As Tube Wrangler posted, 5691 is an industrial version of 6SL7. They were also used extensively by the US military. They were used in mobile equipment, and also missile guidance systems. They have extra support rods that 6SL7's do not have. This makes them extra rugged.
5692 is from same series, replaces 6SN7.
Those tubes are worth good $$$.
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Follow Ups
- RE: RCA 5691 Red Base Tubes - Alpha Al 10:57:42 11/26/14 (2)
- How Much? - geezerrocket 11:28:34 11/26/14 (1)
- RE: How Much? - unclestu 13:01:53 11/26/14 (0)