These are two PCBs of a very low distortion preamplifier using two opamps, each opamp being a single opamp so best channel separation can be obtained. The circuit features good voltage rail decoupling, inspired from design of MBL 5010 preamplifier that also used opamps with special focus on power decoupling to give outstanding performance. The basic configuration of the board can be using 2 NE5534 for stereo application. Newer opamps such as LME49710 can be used too. With the newer opamps, the DC offset compensation connection ( at pin1 and pin 8) can be omitted. Supply voltage : +/-9v to +/-15V. Default gain : 4 times. Input Impedance : 10K The PCBs have a board thickness of 1.6mm, and copper thickness of 70um. This is four times normal board copper thickness ! The surface is gold plated and coated with two-sided solder resist for maximum durability. PCB dimension : 62mm x 60mm We provide schematic and part list to buyers by EMAIL( to be attached to the shipment notice). We do air shipping worldwide at US$6.00. We welcome combine shipping. Track Page Views With Auctiva's FREE Counter Powered by SoldEazy