Hi Chris.
Are you measuring the voltage when the 861 trigger output is connected up to the trigger input on the amp (under load)?
Or just your meter on the trigger output of the 861 without the amplifier connected?

What amp is it?
The Levinson 433?

How about the trigger cable?
Can you describe what connectors are at each end, and how these are wired, 12V and Ov to which pins?


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