Stoked! Replaced the stock tube in the TubePre (bottom) last night with a GrooveTubes 12ZX7-C and it made the unit a lot quieter, and the tube stage sounds pretty cool on instruments!Goodtimes.
I have only played around with the Eureka (top) (has the digital output card!!!) for a little while, but it is a beast... Great Preamp with many nice sculpting tools... 1. Impedance selector 2. Tube Stage. 3. Good compressor 4. Good EQ. 5. Master output knob! Pretty exciting for this geekoid.
Thank you NYC Craigslist!