Check the listing for details. Sonic Imagery Labs 252AP Discrete OpAmp API2520 drop-in upgrade replacement. Condition: New. Listed at 69.00 USD. DESCRIPTION: Model 252AP Discrete Operational Amplifier No other Discrete Op-Amp on the market comes even close to our fully tested specifications. This auction is for Qty(1) Brand New! Fully tested and assembled discrete opamp, ready to drop in and go! This unit is available with 2 pin lengths, Standard 0.30" long or Retro/Vintage 0.50" long, Let us know at time of purchase which pin length you want. See Application Note AN-18 for more details. Model 252AP Datasheet and Specifications PDF Model 252AP 990Enh-Ticha and 995FET-Ticha Mechanical Options Application Note AN-18 Height, Pin Length OPTION's and socketing dimensions for both standard product and retro-clone or vintage upgrades. General Description: Model 252AP Discrete Operational Amplifier The Sonic Imagery Labs Model 252AP is a high performance discrete operational amplifier designed for professional audio applications and areas where ultralow noise and low distortion is required. The 252AP is best suited for use in circuits with medium to high source impedances and with microphone input transformers with high turns ratios (> 1:4). The Model 252AP is a modern re-engineering and redesign of the classic 2520 discrete op-amp. It was designed as an enhanced higher performance upgrade replacement with a focus on superior AC and DC performance. The pinouts conform to the 2520/990 package, allowing direct replacement. The all-discrete SMT design is similar to the API2520 basic topology but has been redesigned to use an ultra-precision differential super-matched input transistor pair specifically designed to meet the requirements of ultra-low noise and ultra-low THD audio systems. A variant (252AP-ULN) is also available for ultra damn low noise applications. (0.560nV/rtHz at 1kHz) Unlike the original API2520 design, the 252AP can incorporate two precision matched pair transistors as the differential input stage. A total of 4 matched devices, for ultra-ultra low noise applications. These devices are selected by the manufacturer at final test to Sonic Imagery Labs noise, Vos, Ic and Vbe matching specifications. DC perfomance is easily a magnitude better than previous counterparts. With an offset voltage of better than ±35uV (at Av1) and input leakage better than