Moving on to the amplifiers. The good news and the bad. They are available at reasonable prices but they are surface mount. The old components were more user friendly but are harder to find. The JFET for example is available for about a dollar each, I recently bought a reel of surface mount JFETs (3000) for $15. The auto industry uses a lot of components that are suited to hobby work, they are low voltage and low power. So the chief designer addresses the issue of small surface mount components. Here is his solution.