This is the data sheet for the ESM532C power op amp that was used in the Master Room XL-305 reverb. It was made by the NPC division of Thomson semiconductor.
https://proaudiodesignforum.com/images/pdf/ESM532C.pdf
Thanks to our new member john1 for sending it.
This part had split supply capability and gobs of output power to drive the spring transducer in a constant current configuration. I liked it because it was so easy to use. It may have been one of the first low-cost power op amps. I suppose that it was discontinued. Apex certainly took that ball and ran with it.
ESM532C Power Op Amp Datasheet
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