Anybody heard of Dynavector Gold 3000 pre

I lucked into this preamplifier. read a little. i guess they only made 124. It has problems and I need schematics. I have an Audio Research tube pre SP9MKII. Would this be an upgrade. Who would anyone suggest for tube pre repair. I live in SLC and our local large shop is a scam. Intermountain. BoOOOOOO! Value?