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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: RCA 5691 Red Base Tubes

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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  • RE: RCA 5691 Red Base Tubes - Alpha Al 10:57:42 11/26/14 (2)

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