OK, fix seems to be setting the jumpers on the Zapco BTL to "C".
However, fun fact - we only could create the problem with the Icelink connected. Disconnected, it worked fine.
I can only conjecture that the current draw of the Icelink and the current draw internal to the current module of the preamp chip seeing the Zapco Symbilink front end combined to freak out some current-limiting feature of the preamp output IC.
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