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Bias!

You know, when you check the idel bias of a class AB amp, you are just making sure that you are not cooking the tube just sitting there. When you play music on a class AB amp, the current draw will go way up. If you are playing relatively loud music and using less than efficient speakers or ones with big impedance swings, you can ask a lot out of your tubes. The idel bias on an AB amp really does not determine tube life if it is within basic limits.
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