Usually spoken of in reference to a tube rectifier. Sag and tube sag-when the things are pushed particularly hard, at least. Notorious for heavy sag, in fact, the sensation is often a combination of rectifier Versus the tight, sharp attack of an amp with a big and efficient power supplyĪnd little difficulty responding at high volumes. Usually blends with tube distortion, inducing a sponginess at the front of the note in amps that experience it, Supplies remain steady-as can preamp tubes when driven hard. Sagging power supply stage, output tubes can induce some juicy,Ĭompression-like sag into the sonic brew when struggling to keep up with theĭemand for amplification at the top of their operating level-even when voltage Their dip in peak performance when rectifier-supplied voltages dip due to a Put simply, this is the amount of time that the tubes-those in the rectifier and output stage in particular-take to recover and return to full power when hit with a heavy demand while running at higher output levels. Sag is a quality that is also sometimes described as “compression” or “squash” or sometimes “swell” or “bloom” as applied to tube amps. Let’s explore how these parameters work in good old-fashioned analog tube amps, to the end of understanding how they might impact your Helix amp settings. Two of the Helix processor’s controls that are frequently overlooked or at least misunderstood are Sag and Bias-and while the results of adjusting these parameters may be subtle at times, they can play a significant part in dialing in your tone to perfection. Dave Hunter: What’s Behind the Sag, Bias, and Bias X Controls in Helix Amps?Įven when we’re getting our precious tone via digital alternatives, the baseline for that sound remains the great tube amps of both yesterday and today-and some of the lesser-known parameters of these creations can have a surprisingly appreciable effect on their overall sound and performance.
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