The ugrades involve improving the power supply, lowering the gain by 3 db, extending the upper limit of treble. You WILL lose the warmth of the amp, but you will gain transparency. The upgrades cost $450 for all. Jack
I do not think you loose any warmth at all with the upgrade. I have not had the Ayre conditioner upgrade, only the circut mod. The amp runs a little hotter, but I think it sounds sweeter and more transparent.
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