Tubes need to be burned in a bit before matching to get a close match. Otherwise they can drift apart as they burn in leading to a poor match. I believe Upscale does this. I know Jim McShane does. The last 2 quads of KT120s I got from him were dead on. Next to no drift. I did not have to adjust the bias again after the first check.
KT150 Tube Matching
Ok. Educate me. I don't know enough to even be dangerous. What are the critical factors used when matching a set of KT150 tubes, say, to go in an Audio Research amp? Transconductance? Bias current draw? A combination of the two? Is there any spec. or threshold on the variations? Does Audio Research do anything special to match their replacement tube sets?
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- 8 posts total
- 8 posts total