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OTK Soviet Union/ Russia NOS 6H9C Preamplifier Driver Tube equivalent 6SL7/6N9P/5691/VT299 Matched Pair 1970s, Audio, Other Audio Equipment on Carousell
OTK Soviet Union/ Russia NOS 6H9C Preamplifier Driver Tube equivalent 6SL7/6N9P/5691/VT299 Matched Pair 1970s, Audio, Other Audio Equipment on Carousell