The 990 discrete op-amp is the finest op-amp available for audio applications. If you want superior sound quality, the 990 can provide it. The 990 is used in the most critical audio applications. Leading recording studios, remote recording companies, disc and CD/DVD mastering facilities, and TV and radio stations use the 990 for superior performance
All John Hardy Co products carry a one year warranty against defects in workmanship or materials.
We sell the 990C for preamp drop-in mods etc, and do not advise on their use in your circuit or provide support for your designs.