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sag - that's where when you play real hard, the rectifier tube can't quite keep up with the voltage required by the power tubes, due to an internal resistance factor. So the power tubes get a little less voltage than required to stay "linear" and the output gets a little compressed, in a natural way.
Blues guitar solo players like this sound. It is part of the expressiveness of the guitar/amp combination.
Many players insist on a certain amount of "sag"; this can be controlled by the type of rectifier tube used (among other variables). Many other players choose for no sag. Solid-state rectifiers generally do not exhibit 'sag'.
Tweed Bassmans used tube rectifiers, and had 'sag'. Fender messed around a lot with different rectifiers over the years, dealing with the 'sag' factor. Marshall originally copied the Bassman circuit, but quickly dropped the tube rectifier in favor of a solid-state rectifier which eliminated the 'sag' factor.
Both type of amps now have dedicated and die-hard fans. I kind of prefer solid-state rectifiers with no sag. But many other members here will have a different opinion.
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