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1957 RCA 5691 6SL7GT Tube, High Testing | Reverb France
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NOS Tube Store: Standard 33S29B / 5691 Sweden
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Recommended Pair) 5691 RCA red base gray plates 1968-1974 (2.2/
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5691 RCA Black Plate Red Base Octal Twin Triode Tube
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NOS RCA JAN CRC 5691 Tube, Red Base, NOS/New, 1950s, USA, Test New/Balanced, Superb Performance For Sale - US Audio Mart
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5691 Heintz Kaufman Valves Tubes x 2 NOS (V36) | Vintage Electronics
