Ok, I understand.
So I'll keep my fingers crossed that it solves the problem.
Another idea: The speakers are connected right, aren't they?
The attached diagram is part of the 1977 wiring diagram.
in general, a service manual could be helpful. It explains the functions, adjustment, lists all parts, schematics and even offers a trouble shooting section.
Check with Victory Glass for their manual #3470 for all 1977 models by the Deutsche Wurlitzer (they list it as GmbH W. Germany 1977 Models Service, TS Guide and Parts 104 Pages).
Hildegard

