TUBES
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TUBES


PrimaLuna is testing there tubes as follows. Premium Tube Selection tubes are pre-selected by us simple 60 out of 100 rule. All manufacturer quality approved tubes are tested again by our incoming quality control people. Out of 100 tubes approved by us, we keep the 60 best ones. The rest is being returned to the tube manufacturer who uses these tubes mainly for guitar amplifiers, etc... From these 60tubes we are matching Quad-Sets with measurements results as close together as possible.