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Original Message

I think Jedrider has it right...

Posted by Lew on April 9, 2021 at 18:19:19:

The thing wants to see some voltage above 12V at its input, probably because it has its own internal regulators that drop some voltage. If you don't feed it enough to trigger, it's dead. I had the same or a similar experience with a linear supply I built for a solid state phono stage. The preamp had markings on its PS input socket stating the min and max DC voltages it wanted to be fed, so I knew what my problem was in that case.