Are future improvements in Amp/PreAmps slowing to a crawl?

I am not talking specifically about power amps. It applies to all circuitry, phono stages, line stages, and analog back ends in DACs.

This is why if you listen to older recordings made in an all vacuum tube studio using tube mic preamps, they are the most stunning captures.

I have understood the "magic" of tubes for years. I would have been happy to duplicate that "magic" using transistors. Most other designers have defaulted to the second best device - the almighty JFETs , MOSFETs which because of the field effect closely approximates the more linear grid control.

That's why the popular JFET craze is so well accepted. However, they too have time warp issues that need to go away in order to compete with air which is 100% linear and has zero distortion.

OK- so this sounds like to me that the correct answer to my question is 'no'.

With all due respect I'm still not sure what you are asking.
If you want to know the value of the output velocity it equals the input velocity +/- zero.

It does not add any acceleration or de-acceleration.

The sound of a circuit is the signature of how its velocity is handled.

Are you sitting down?

I can install an auto-focus circuit to control the velocity of a tube circuit and achieve exactly the same sound as a solid state circuit with the same auto-focus. They would both produce the same holographic images.

Roger

Let me ask a simple question of anyone reading this post. This might lead to an understanding of what I'm talking about. It also may pull your thinking slightly outside the box.

Do you know what part or area of a circuit determines the signal to noise ratio of the circuit?

Please refrain from wise guy answers. Thank you.