The magic behind vintage amps, what makes them sound and feel so good, are their saggy power supplies. The magic behind modern amps, what makes them so intoxicating, are their tight power supplies and higher gain preamps.
Vintage tube amps typically produce about 20% sag, while more modern transistor amps produce about 2% sag. Modern attempts to produce sag, such as adding solid state or tube rectifiers, yield sag rates of approximately 5% and 15%, respectively.
Preamp distortion is very intoxicating because it creates intense touch sensitivity: the strings on your guitar become very sensitive to your touch. Whether you strum them hard of soft, you get a ton of distortion. However, this type of sensitivity can sometimes cause notes to mush together, compromising note articulation.
Power amp distortion creates a vintage sound that traditionally can only be produced by blasting the amp. Traditionally, the only way you can experience the sound and feel of power amp distortion is to crank your amp as loud as it can go.
Two new knobs, Sag control and Wattage control with an impressive array of other features and benefits), combine to give you and your customers vintage and modern tone like you've never heard, felt, or controlled before.
Preamp gain is also affected by the Sag knob. With the Sag turned up, preamp distortion is more compressed and smooth with less higher harmonics. Turn the Sag knob down and the preamp becomes punchier, less comressed with more higher harmnonics and a modern tone
The Sag Circuit not only gives your customers intense "attack" or touch sensitivity or sparkle, it allows them to control how much they want.
Sag control is completely functional at ALL wattage settings; your customers are in control at all times.