[Milsurplus] ID Navy Autotransformer

[Bob kb8tq]

Hi

That’s a very normal gizmo for a small craft that needs to hook up to “shore power”. 

You pull up to the dock in who knows where. The local “nominal” voltage is something odd. What you get when you plug in might not be remotely close to that nominal. 

You need to keep the radio(s) going and maybe the lights. Batteries only last just so long. 

Is what you have intended for this use? I haven’t a clue …..

Bob

> On Feb 19, 2026, at 6:21 AM, Rob Flory <farmer.rob.flory at gmail.com> wrote:
> 
> Hi,
> 
> I was deep digging in my garage and pulled out what I had been assuming was a low-voltage transformer.  On cleaning I found the terminals labelled 0-115-190-200-210-220-230-240-250 with continuity all the way through.  It looks to be in the 500W class.  On removing it from the steel box it was roughly cobbled into, I spotted the Navy anchor stamp.  
> 
> It strikes me as something to run 115V equipment off of a not-well-controlled 220V supply.  I can see in my mind's eye three of these things in a row on a bulkhead, perhaps to bring the 3-phase ship's power down to 115V
> 
> No nomenclature I can find.  
> 
> Has anyone run across something like this?
> 
> RF
> 
> 
> 
> 
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html