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For sale is a military surplus PP-1104C/G power supply. It is dual input voltage and dual output voltage, very easily switchable. Input voltage is 120 and 240 volts single phase, output voltage is 14 and 28 nominal volts.
Note that the power supply is actually adjustable and the high output range is approximately 25-39 volts. The low output range is twice less. To switch between high and low range you need to relink a couple of links on the front. (these links parallel two separate outputs or put them in series)
See below for PDF manuals.
This power supply is actually regulated, ripple is 0.9% and regulation (1 - (voltage under full load) / (voltage at no load) ) is 4%. Regulation is done by means of a magnetic amplifier. This is a 40 year old technology and is completely bulletproof, requiring zero maintenance and capable of taking a lot of abuse.
I have tested this power supply with a low voltage load bank, it operates to spec. You can see pictures of it operating.
This power supply is currently wired for 110V input and has a standard 15A plug. At full power, it requires 24 A at 110V, so you need to either not use it at full power or put it on appropriate breaker. (other power supplies that I have may be wired differently, but I can rewire them)
I have a total of five power supplies. I might keep one of them. I have tested only this one so far, so some may not be working (which would surprise me) -- but for interested buyers, I could check. Extra supplies be offered to the highest bidder only, via eBay. For detailed pictures of testing, click here for details of how I tested another power supply that sold for $99. I tested this one also.
It weighs 152 lbs, just above the UPS limit. Local pickup is FREE. Shipping is responsibility of the buyer (see the Freightquote calculator, you are responsible for ALL fees). I can deliver this item to a local shipping dock, for $50. That could save you a bundle. $10 extra for delivering more power supplies.