I owned a LS7 when it first came out. I wouldn't spend the money for a couple reasons. Not that they demand a lot of money today, but modifying it will reduce its value. I never thought it was all that good of a preamp to begin with; it wasn't horrible but there were many preamps that were much better at the time and one being a solid state, the LS3 was a much better piece. I'd suggest unload it and look for something different altogether.
Hate to keep bringing up this preamp but it's a tuff one to beat. A ModWright SWL 9.0 SE will walk all over your LS7 no matter what you do to it, and you'll be money ahead. I owned the SWL for awhile so I do know this preamp as well.
Sorry for the bad news. Good luck.
Hate to keep bringing up this preamp but it's a tuff one to beat. A ModWright SWL 9.0 SE will walk all over your LS7 no matter what you do to it, and you'll be money ahead. I owned the SWL for awhile so I do know this preamp as well.
Sorry for the bad news. Good luck.