High; valves wear out (2,000–5,000 hours) and require periodic replacement.
Compact and lightweight; can be miniaturized into tiny devices. Valve vs Solid State Amplifiers - Audio Affair Blog Valve and Transistor Audio Amplifiers
Heavy and bulky due to large output transformers and cooling needs. High; valves wear out (2,000–5,000 hours) and require
High; energy-efficient, runs cool, and is immediately usable. valves wear out (2
Minimal; transistors have extremely long lifespans and rarely fail.