Preamp modifications - who would you use?

Hi guys,
Sorry for the inactivity. For some reason a response I wrote last night didn't post. Again, thanks for the great suggestions.

Tvad, no I am not modding the Lamm. I have actually sold it and moved on in a different direction - I do need to upgrade my system page but my gear has been changing a bit. BTW - I have conversed with another Lamm owner who has performed significant mods to his LL2 (caps, attenuators, diodes) and he says it is now comparable with anything out there.

The preamp I am considering to be modded is a MUSE Model Three Signature with outboard display and power supply. I now have the MUSE Erato II player as my source and by using the Model Three Signature I have a single remote to interface with my entire system - very convenient. The Model Three Signature actually sounds quite good for an older model $3,500 preamp and, to me, it is largely comparable sonically with most other higher priced preamps I have owned. It has a wealth of features that make it desirable for me to use so I would like to see if it can be improved sonically, even a little.

I don't want to make any fundamental changes but to mainly improve on the basic implementation, perhaps with better parts or other changes that could be recommended. It is based on dual Burr Brown chip volume controls, as used in the $10k Esoteric C03, so maybe it was a bit ahead of its time. The designer, Kevin Halverson, has told me he has heard other preamps that may equal the Three Signature, but in his opinion, none that are better. He may be a little biased, but it sounds good enough to me also.

Well...when it came down to it the potential pitfalls you mention definitely weighed in as a factor in choosing not to mod my LL2.

However, the modded LL2 I described had the best quality upgrade parts such as Dueland coupling caps, Eurocap bypass caps, DACT attenuators, RAM diode bridges, and Jensen electrolytics. The owner did not change the design and he did the work himself - a first rate job based on the pictures I saw. Unfortunately, I am not located in the same area and have not heard it. As you point out, modding includes risks - and the LL2 does sound great in its stock form. However, I would definitely buy that modded unit if it were ever posted for sale.

Mitch2, Unlike with cars, swapping out parts in audio components, even for superior parts, does not guarantee improved performance. One reason is that, even when you choose parts rated same value, they don’t operate identically to the part they replaced. This can have a cascade effect on the parts around them. Other parts might not now be operating optimally. It’s a lot like taking medication. There can be unintended side effects.

Modifiers, like Dan Wright, who choose a component, study it and spend a good long time tinkering and testing, are a whole different story. Unless you choose a modifier who specializes in modifying your particular preamp, you’re unlikely to get that kind of analysis and testing.