Selling my Matrix M-Stage with Burr Brown OPA627AP biasing mod. Excellent condition, great sound. Comes with original op-amp as well as the double OPA627 op-amp on an adapter, which was purchased from Tam Audio. No issues. Asking $230$220$210$200 $180. Buyer pays $15 shipping and PayPal fees, unless paid as gift. Ask questions please. Thanks!