samamp guitar amplifiers are point to point hand wired with "class a" vacuum tube circuitry. The V.A.C. - Variable Amplitude Clipping control is a unique feature with five wattage settings. The point at which the output tubes clip is sometimes called the sweet spot. This is volume compression and output limiting at its best. How loud the amp is at clipping is determined by its output power. The V.A.C. circuit is a different way to control the output power of a tube amplifier. Not a built in speaker attenuator and not in the signal path, the V.A.C. circuit uses lamps (light bulbs) to limit voltage and current flow into the power tubes. This balanced circuit forces the power tubes to act like smaller power tubes. Power tubes run cooler with V.A.C. and all of the output power reaches the speaker. 

Readily available lamps are used: 15 watt exit sign, 7 watt "night light", and 4 watt "night light".  Take advantage of the "feel" and touch sensitivity that coincide with volume compression and output limiting!