Which AI pre are you using?
Odds are, you won't be able to match the warmth and open sound for a reasonable price. You should demo gear to test it against. NOS tubes for the AI are a lot cheaper than a new pre.
Odds are, you won't be able to match the warmth and open sound for a reasonable price. You should demo gear to test it against. NOS tubes for the AI are a lot cheaper than a new pre.