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Original Message

I believe in your first concept ...

Posted by KIS on July 22, 2012 at 02:49:25:

Preamp sucks.

High quality stepped attenuator; ladder or series, installed in the amp is the way to go. Yes, you need to drill a hole on the chassis of your amp, else you lose too much.

IC needs to be also short to prevent capacitance built-up.

My tube amps need on 300mV to give full power. What is yoyrs?

However in most cases where the input sensitivity of the amp is low (1.2mV is pretty standard), a preamp does improve dynamics, but still loses openness and liquidity.

YMMV obviously.