Over a period of several years we continued this rather informal investigation of the electronic sound problem. In the past, we have heard many widely varied theories that explain the problem, but no one, however, could actually measure it in meaningful terms. Anyone who listens to phonograph records closely can tell that tubes sound different from transistors. Defining what this difference is, however, is a complex psychoacoustical problem. Any investigation of this admittedly subtle phenomenon must really begin with a few human observations.
Some people try to point out and describe valid differences.
Others just object to the entire thesis and resort to spouting opinions. It is the listener's job to sort out the facts from the fiction. Electrical engineers, especially the ones who design recording equipment, can prove that these is no difference in tube or transistor sound. They do this by showing the latest specification sheets and quoting electronic figures which are visually quite impressive. It is true, according to the parameters being measured, that these is only a marginal difference in the signal quality.