Antique Sound Labs

ASL was a very active brand from about 1995 to 2015. Divergent Technologies in Canada was the importer. I do not think you'll find schematics online - these are usually not shared. Try to contact Tosh at Divertech - he is the Copland importer for North America.

Nothing to add of assistance but felt like noting that this thread is why I first starting using this site. Good questions with smart useful answers. Information is really important in finding the gear and room that lets the music touch your soul.

@jmalen123 

+1

Maybe get in touch with Tosh Goka of Reference 3A?

Ah, direction already given.