Quad RCA Raytheon GE 12AT7 ECC81 Audio Tubes Tested 90/102 101/120 83/71 91/105

Quad RCA Raytheon GE 12AT7 ECC81 Audio Tubes. #1 and #4 would be a matched pair. Tested Good @ 90/102, 101/120, 83/71 and 91/105 with a minimum of 55/55.

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