Preamp modifications - who would you use?

I believe mods are an excellent way to improve upon a component that is clearly lacking in some way.

Tvad, I agree with your observations regarding the risk of screwing up something that a good designer spent a considerable amount of time to design and spec. The Lamm may therefore be a poor example to use for this case. However, there are other examples where equipment was designed to a price point limiting the cost of components, where the equipment is older and the available parts quality has improved since the original design, and where newer technology has become available (such as in power filtration and regulation). Those types of examples may be more applicable here. I plan to start with a couple of the names on the list, send some pictures of the insides of the preamp and power supply, talk with them about what they believe can may be accomplished, and then decide how/if I want to proceed.

I appreciate the names provided here, several of which I did not initially consider, and I also found benefit in the general discussion regarding the risks of modding equipment.

"01-13-10: Ejmac70
During the modified period, there was greater top-end sparkle; however, the unit also lost all of the musical characteristics for which one selects a Jadis product! To be clear, I do not recommend this option.”

I extracted the above from another thread because it exemplifies what I believe to be one of the greatest caution points of modifications: The achievement of a specific desired virtue at the expense of the subtle voicing of a component. I can almost assure you that some of the changes made involved upgrading parts.

I too believe Tvad is giving very good advice to consider. There is also the question of what happens should you ever need to send the unit back to the original manufacturer for any repair or work. What happens then to the modded parts and work?

Good luck,
Will

Consider Wayne of Bolder Cable Co. I've got him working on a DAC for me now and from my experience with other pieces he's modified he does great work.