Confirming PSU spec for steppers.

[Rogue]

So we were saying mostly the same thing. That's a good start :)

I think I've worked out where my mental block is for this element at least. I was treating parallel as increasing A rather than decreasing the division of A. In other words, I was thinking of two outputs, each with 50V 625VA. Parallel would make this one output of 50V 1250VA. Rather, I should be looking at it as two outputs of 50V sharing 625VA between them - effectively making it 100V / 625VA = 6.2A. Wiring it in parallel would then have the same VA but divided by less, which has the same end effect as doubling it: 50V / 625VA = 12.5A. When I look at it like this, your previous comments make more sense so I guess I'm on the right track.

And you wonder why I get jittery with mains power

[Jonathan]

And you wonder why I get jittery with mains power

This is the secondary winding, no mains there

The core of the transformer is primarily what determines the power rating, hence why changing the windings from series to parallel cannot change the power rating (VA) you get.

[irving2008]

This is the secondary winding, no mains there

The core of the transformer is primarily what determines the power rating, hence why changing the windings from series to parallel cannot change the power rating (VA) you get.

But remember the old adage: Its volts that jolts but Amps that kills... so 70v at 12A still needs treating with respect

[Rogue]

But remember the old adage: Its volts that jolts but Amps that kills... so 70v at 12A still needs treating with respect

I thought the old adage was "Of course it's not live, I checked it just a few miARRRggRGRgrGRGGRGRHHHHH"?