[Chas]

Some of the audio folks think any modern part is bad! The only way to have a perfect sound is to have 60 year old caps in a system. Some folks think the earth is flat... David

Sound is everything... In a concert hall or practically any musical venue, there are delays in the sound as well as attenuation from clothing, tapestry and ceiling texture that the live listener cannot consciously detect with exception of echos. When an audio system is used in a home the environment can be similar but instruments and performance speakers in use do not exist, being replaced by the systems speakers. That, amplifiers, in order to more faithfully replicate the concert venue environment have timing delays, for a tube amp these are accidental. However, leaking components can accidentally" enhance these delays. But, there in, it is an inexact science and any two deteriorated capacitors are not going to leak at the same levels...

Musicians that use electronic instruments are well aware of the lack of delay in a solid-state amplifiers and often use devices that delay, color or what ever term change the tonal qualities, then send that modified sound to the amps. Such that the amp is FLAT with minimal delay now reproduces the sound without change.

That is how it should be accomplished for the home system. But so long as there are "Black Arts" and the associated jargon there will be folks who are happy to do and have equipment that is operating at some level of inexact reproduction... It is their ears/brain/pocketbook that has to be happy.