If this schematic is right, it is a high-pass filter (engaged it cuts very low frequencies). It's purpose is probably to filter out rumble when playing records.
https://www.lencoheaven.net/forum/i...kpihk0e92t862&topic=23215.msg326497#msg326497
https://www.lencoheaven.net/forum/i...kpihk0e92t862&topic=23215.msg326497#msg326497
At one point i might have been able to see that, but i misplaced the schematic years ago. Are you willing to share? It would be helpful when i eventually sell.
The forumpost/schematic I linked to is not mine. So you just have to copy the schematic from that forumpost (the last picture in that post is not too vague).