4 Vintage RCA/Assorted Label 6K6 Power Tubes. Satisfaction Guaranteed.
Brands include CBS Hytron, Philco, & RCA.
All 4 appear to be made by RCA due to the stop sign stamped tube designation.
Tested on Precision Apparatus Model 10-12; where the minimum good reading is 54.
Tube #1 = 71, Tube #2 = 68, Tube #3 = 67, Tube #4 = 58
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