Old School Audio (OSA) MP1 500 series preamp (one of two, see photos). Earlier model but still works great. Jensen transformer, discrete, has great tone overall. I originally purchased as a poor man's substitution for an API 512c– and it sounds pretty damn close! Pots & switches are a little scratchy and could use some cleaning, and there is general cosmetic wear & tear from age, but nothing that seems to affect overall functionality once you dial in your settings.
Letting go for cheaper than what I see is market value on here (other listings are ranging for $300+). I also have a second one in another listing – same condition and price. Thanks for looking!
