• the interaction or cooperation of two or more organizations, substances, or other agents to produce a combined effect greater than the sum of their separate effects.
An old saying, "The whole is greater than the sum of its parts", expresses the basic meaning of Synergy.
Amplifiers are basically a planned amalgamation of transformers, transistors, capacitors and tubes that can increase the power of a given input signal. However, the care, thought and expertise put into the choosing of the actual components, and how they are assembled affects the final tone in very unique ways.
When a reasonable amount of care is taken, combined with a mass market sensibility for components, you wind up with a decent sounding amp ready for mass production.