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5692 RCA RED BASE black plates 1953
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Recommended Pair) 5691 RCA red base gray plates 1968-1974 (2.2/
5691 JAN / CRC = RCA "Super 6SL7GT "
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Matched Pair: Raytheon 5691 Vacuum Tube Red Base Black Plates Support Rods Manufactured by RCA Matching Date Codes - Etsy Canada
The 6SN7 Identification Guide | Page 9 | Headphone Reviews and Discussion - Head-Fi.org
2 RCA JAN CRC 5692 6SN7 Black Plate, 3 Mica, Red Base Tubes Photo #1476720 - Canuck Audio Mart
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World Best NOS 5692 6SN7 RCA Red Base Dual Triode Perfect Matched Pair Power Audiophile Tubes
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