Yeah, the amp is incredibly loud, especially for a 1/12 combo.Wyzard wrote:My tech has a full Audio Precision test suite, and shows me how well a matched pair/quad/sextet of output tubes is performing up to full rated output on the scope. Of all the Mk amps I've ever bought with original tubes, only one Sylvania 6L6 has ever needed replacing: that's probably out of more than fifty total. You could both see and hear it was in trouble, too, anyway.
Simple replacement is the least-resistance option of techs without full testing facilities, and in the old days when you could pick up a quartet of USA 6L6GCs for tuppence ha'penny or a couple of pints fresh goat milk, that was ok.
As tony777 observes, if they sound like they're working, and the amp is louder than the average bear, then there's no need to replace. Least of all with tubes that almost never sound as good as original Sylvanias.
Mark I's, II's, III's and the almight IV