Lot of 4 Vintage made in USA 12SN7 Medium-Mu Dual Triode radio tubes. Satisfaction Guaranteed.
Made by RCA & Raytheon, all in original boxes.
Tested on Precision Apparatus Model 10-12; where the minimum good reading is 54.
Tube #1 = 68/66, Tube #2 = 66/72, Tube #3 = 63/65, Tube #4 = 60/60
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