Brent Jessee Recording is a little northwest of Chicago at:
1590 West Algonquin Road #111
Hoffman Estates, IL 60192
He does not do tube repairs but he is a major tube seller and might be willing to give your preamp a listen if you give him a call or he could probably direct you to someone who works on tube gear in your area.
Google his name for his webpage. He could give you some good advice when you get ready to buy new tubes.
1590 West Algonquin Road #111
Hoffman Estates, IL 60192
He does not do tube repairs but he is a major tube seller and might be willing to give your preamp a listen if you give him a call or he could probably direct you to someone who works on tube gear in your area.
Google his name for his webpage. He could give you some good advice when you get ready to buy new tubes.