Notes on this upgrade:
The vintage tube sound upgrade can be made so the warmth is subtle or not so subtle. DSP is not involved and the tone upgrade does not add a significant number of components within the amplification stages.
Ideal amplifier upgrades typically do not introduce major changes within the gain stages of an amplifier. For example, the DC filament upgrade isn't even within the gain stages, yet provides exceptional improvements to low volume detail. The vintage tube sound upgrade is within the amplifier stages, but is completely passive and does not complicate anything from the music's point of view (where signals travel). Another example of an ideal upgrade would be Micalex sockets. Zero signal processing, yet there is better performance through high grade 1960's style mil-spec contacts. Are there better sockets? I don't think so. There are pricier ones, but as you know, I don't shop by the expensive is better rule.
Other thoughts regarding this circuit:
If you require an amplifier to run only mids, bass or highs (bi or tri-amplification), this upgrade is ideal for you. Energy can be placed specifically where you need it with premium results. The modifications required for these specific purposes will not make the upgrade any more expensive. Please note that the tone modifications are able to be turned off. It's like having two amplifiers in one. Our NEW hybrid class D amplifiers will be compatible with this upgrade.
In a nutshell, if you want or crave a specific kind of tone, I can do it.
