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(!!) (Best Pair) 6CA4 Tungsol branded RAD TEL NOS 1961 (52/40 and 52/40 x 2 tubes) 1% matched
5V3 Raytheon branded RAD-TEL NOS 1961 (53/40 and 54/40)
5Y4GA Sylvania branded Zenith NOS 1960's (54/40 and 57/40)
5Y4GA Sylvania NOS 1960's (53/40 and 58/40)
