Eldartford, digital modeling amps have been around for years in the guitar world. As far as I can tell, people only play them out of desperation as they are a far cry from the thing that they are trying to model, i.e. a Marshall Plexi or Fender Twin. Its going to take more convincing than is possible in a thread to make modeling a plausible exercise for high end audio!
Mapman, not exactly. Pentodes are less linear in some ways than some CMOS devices, but still are more linear than a bipolar device. So the comment is a generalization, but only barely. In the case of triodes, there are no transistors, even the best fets and their variants, that are as linear.
Linearity in the device is a big deal if you want true audio/musical performance. Without it you will have to run less gain per stage and more feedback, making for a considerably more complex circuit. The simplicity of tube circuits is one of the ways that they rule over transistors.
Simple transistor circuits are rare. Their master is Nelson Pass. He has sorted out some of these simple facts, and built some of the best-sounding transistor amps around. But when you examine them, you will find that many of the so-called advantages of transistors (low output impedance, low heat) have been thrown out in favor of real advantages (performance that is musical to the human ear).
Mapman, not exactly. Pentodes are less linear in some ways than some CMOS devices, but still are more linear than a bipolar device. So the comment is a generalization, but only barely. In the case of triodes, there are no transistors, even the best fets and their variants, that are as linear.
Linearity in the device is a big deal if you want true audio/musical performance. Without it you will have to run less gain per stage and more feedback, making for a considerably more complex circuit. The simplicity of tube circuits is one of the ways that they rule over transistors.
Simple transistor circuits are rare. Their master is Nelson Pass. He has sorted out some of these simple facts, and built some of the best-sounding transistor amps around. But when you examine them, you will find that many of the so-called advantages of transistors (low output impedance, low heat) have been thrown out in favor of real advantages (performance that is musical to the human ear).