Hi guys,

I've got three Alinco DM-330MV 32 amp power supplies. One of them is an early serial number (1023). The others are in the 10000s.

The low serial number PSU always performed weirdly. First, when it hits a heavy load the voltage does not sag, it goes up by .75v. Second, this may have been a pre-production unit since it only had a two prong plug and no provision for a ground.

I've corrected the ground problem by getting a schematic and comparing to my other units. It's been re-wired and tested for smoke. We're good.

But- the irregularity of the voltage is a concern. There is a pot on the board, which based on my read of the schematic, should allow me to change the character of the output voltage at load. I'll give it a try as soon as I find my plastic screwdriver.

The question is this: Have any of you seen an over-voltage behavior like this and what was the cause?