This week’s podcast which considers the relative merits of valve and solid-state circuitry in high-fidelity audio amplification. We use the term “solid state’ because the discrete transistors of early designs have now largely been superseded by integrated circuits incorporating many transistors Transistors largely replaced valves in the 1960s, but have retained a niche market in high-end, and also some budget enthusiast products, and we will try to understand why. As valve amplification is often associated with fans of acoustic music, this week’s music is a piece of acoustic jazz entitled Fast Jazz by WaveMaster and used under a Pixabay licence.  I hope that you enjoy the podcast!