Audiophilepure

That said, there’s a slight price to pay for this extra musicality. Although the KT88s are capable of cranking more volume than the 6550s in triode mode, they don’t quite match that tube complement’s tetrode muscle. So, one will, on occasion—especially if in a mood to crank some heavier rock—cause a tube to draw excess current, which activates the fault-sensing system to protect the amplifier by shutting down. A deck-mounted LED next to each of the output tubes indicates which one is having a problem, and rebooting takes about a minute. Now and then a tube may completely fail, requiring replacement, but that’s rare and, in any case, is something all tubes are prone to.

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