Radial Engineering Twin-Servo 500 Series Preamplifier

Update of a classic Originally developed in 1988, the twin-servo 500 is an adaptation that fits the 500 series format The design begins with two 100% discrete 990 op-amps cascaded in tandem to deliver 60d b of gain with less than 1/10th the distortion and twice the bandwidth of a single stage design This maximizes the gain-margin so no matter what the input, the lowest possible distortion will be realized This also reduces noise at mid and low levels, a critical advantage