New to the forum. I work at NASA during the day as a GNC engineer/manager. I have several hobbies and one is building and repairing home and pro audio equipment for many years now. I learned several years backt that some designs use opamps in the feedback loop to manage DC offsets. With this latest project, I have run into a situation with an opamp I have never come across before.
I have a vintage Nakamichi CA-5AII preamplifier which uses several of the old µPC811 opamps as servos. Does anyone have an idea which current opamp, or range of opamps, will replace these? They are not directly in the signal path, however I think these are causing some issues with sound quality. It also has some NE5542s in the phono section that are in the actual signal path. These seem to be fine. Any help is much appreciated.
I have a vintage Nakamichi CA-5AII preamplifier which uses several of the old µPC811 opamps as servos. Does anyone have an idea which current opamp, or range of opamps, will replace these? They are not directly in the signal path, however I think these are causing some issues with sound quality. It also has some NE5542s in the phono section that are in the actual signal path. These seem to be fine. Any help is much appreciated.