3 Vintage Sylvania 12AU7A/ECC82 Dual Triode Preamp Tubes, Satisfaction Guaranteed.
One of them has short black plate, the other two have long grey plates
Tested on Precision Apparatus Model 10-12
Tube #1 = 68/67, Tube #2 = 66/64, Tube #3 = 60/60; where the minimum good reading is 54.
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