AH! Tjoeb Tjoens. Specially selected opamps to exchange with the standard Burr Brown OPA604 opamps. We selected the LCAudio/AD825 and the Burr Brown OPA627. Due to the opamp-sockets on the AH! Njoe Tjoeb 4000 outputboard, you can fine-tune your Njoe Tjoeb 4000 with different tubes and different opamps.
