Three Vintage CBS & Rauland 12AX7 Dual Triode Preamp Tubes, Satisfaction Guaranteed.
Made in USA by RCA. Long grey plate, d-getter.
Tested strong on a Precision Apparatus Model 10-12; where the minimum good reading is 54.
Tube #1 = 78/78, Tube #2 = 70/65, Tube #3 = 63/65
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