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1178 Channel A "Railing"

One of favorite units, the 1178 is a very useful tool. This one has an issue when the needle intermittently pins hard right. It took a while to replicate the issue on the bench. It might be a cap, cold solder joint, opamp?


I don't know yet, I am going to start to trace the problem from the output back to the input.

I added Jensen input transformers to this same unit previously and did not see this issue.  Also had to make discreet JFET replacement for it. So I check those mods out too.



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