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RCA 5691

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Canuck Audio Mart

Quad of RCA 5691 red base , tested very very strong ( Sold ! ) Canuck Audio Mart CA$280 Oct 23, 2025

OldSound

6SL7GT RCA TUBE 6SL7 VT-229 ECC35 5691 CV1984 PAIR DOUBLE TRIODE AUDIO PREAMPLIFIER NOS/NIB OldSound €79 Jun 14, 2025

OldSound

5691 RCA VT-229 ECC35 6SL7 CV1984 VALVE DOUBLE TRIODE AUDIO PREAMPLIFIER, TOP QUALITY NOS 100% OK OldSound €119 25% Mar 21, 2025

OldSound

5691 RCA VT-229 ECC35 6SL7 CV1984 VALVE COUPLE DOUBLE TRIODE AUDIO PREAMPLIFIER, TOP QUALITY NOS 100% OK OldSound €189 Mar 21, 2025

US Audio Mart

Pr NOS Vintage RCA 5691 Red Base Tubes,D Getters, 5 Support Rods,BoxesTest New/Balanced/New,1950 US Audio Mart $188 18% Nov 15, 2023

US Audio Mart

RCA 6SL7 - 5691 - Superb Valve US Audio Mart $450 125% Sep 13, 2021

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