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Deleted member 5962
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Actually... I don't think this amp disconnects two tubes. I thought I had read that here a while back. But recently I zoomed in on a photo one of you put up and it said the half power mode was Triode operation and the full power was Pentode. That would mean they aren't cutting two tubes, but switching power modes. That means you are still using all 4 tubes, just going Triode, when using the half power mode.The answer is yes.Tubes that don't get used don't get wear.
Edit: I just checked the Archon manual to be sure, and it clearly says the half power mode on the 100 watt is a Pentode/Triode switch, meaning it always uses all 4 tubes.