RCA5691usedI have 2 new in the box rca 3 mica black plate 10000 hour 5691 tubes with the 11 style steel rods for no microphonics occur.I have 4 of these tubes available if you need a quad I can list the other...120.00
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2 new in the box rca 3 mica black plate 5691 tubes/ 10000 hour 6SL7 tubes [Expired]
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rareoldtubes member since September 2017
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