Found these rca 5692 red base tubes in an old oscilloscope . Tested at 75%. I don't have anything to put Them in, yet, but maybe later down the road I will.
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World Best NOS 5692 6SN7 RCA Red Base Dual Triode Perfect Matched Pair Power Audiophile Tubes
5692 tube x2 6SN7 BROWN BASE NOS Zalitron NIB by CBS-Hytron VT231 – ASA College: Florida
World Best NOS 5692 6SN7 RCA Red Base Dual Triode Perfect Matched Pair Power Audiophile Tubes