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

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.

As I understand it Roger, you have a means of detecting this 'velocity' but what I found peculiar last time I engaged in this topic was that you had not quantified this velocity as a specification. I'm pretty sure you're not talking about risetime/slew rate.

The question is, have you quantified this circuit operation with a spec? Or put another way, have you quantified the 'velocity' spec?

At least you confirmed one thing- that you are not talking about risetime/slew rate.

Yes I am not talking about slew rates like volts/us.

The velocity spec is that the output velocity must = the input velocity.
By default the signal entering the circuit has a horizontal (time domain) velocity of Mach One because the music was captured at that speed.
Unless you maintain this "embedded" velocity you are going to inject small amounts of Doppler into the chain producing an out of focus result.

If you record music on a tape machine at 15 ips you must set the playback speed also at 15 ips. If your tape machine during playback is actually 15.05 ips you will have a slight leaning towards Micky Mouse.
If it is playing back at 14.95 ips it is leaning more towards Barry White.
This degree of deviation does not sound like a lot but to the projected image it is devastating.

Even thought the amplifier has no moving parts and does not seem like it can vary the playback speed - but it does.

It alters the velocity the same as a poor capstan servo. It is the equivalent of wow and flutter.

When the music signal encounters a non-linear event - the delivery speed is altered.

A superposed "hologram" will collapse and every instrument in the performance will have the same degree of focus or lack thereof.