API 3124+ (with aftermarket opamps)

Some cosmetic defects such as rack rash and a few spots of oxidation on the top. The original opamps were a problem with these units due to APIs poor potting, so I replaced them all with aftermarket third party opamps. Channels 1 and 2 are Scott Lieber blue dot, Channel 3 Scott Lieber red dot, and Channel 4 Gary Barnett's GAR 2520.

The unit comes with an additional red dot and GAR opamp.

These opamps are pinned, not soldered, so they are plug and play.

The blue dot is supposed to be a better 2520, the red dot a warmer vintage 2520, and the GAR has more transistors so its driven to saturate more easily. Links to the websites for these aftermarkets provided below. At the time all of these came highly recommended on Gearslutz (now GearSpace)

The unit also comes with the original clipped disabled opamps. API just recently started selling their proprietary new opamps for these units separately, but require proof you destroyed the original ones. They cost $75 each.

Here are some sites to check out the features and character of the aftermarket op amps, and the Scott Lieber link has a video shootout on acoustic guitar: