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RE: Do tube preamps add or take away dynamics

Think in terms of avoiding info. loss.

Passive control centers exhibit inherently high O/P impedance and poor drive capability. LOW capacitance (read short and unshielded) cabling to the power amp(s) is essential. Notice the lack of flexibility. Also, a pentode voltage gain block at the power amp(s) I/P(s) is helpful, as it allows a high I/P impedance, without adverse CMiller interaction.

An active control center, with or without voltage gain, typically has a lowish to low O/P impedance and decent or better drive capability. Flexibility is present, but "colorations", bandwidth limitations ... may be negatives.

All legitimate options are compromises. Each 'phile decides which way to "jump". We are dealing with yet another perfection is the enemy of the very good situation. A "perfect" solution simply doesn't exist.

Eli D.


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