suggestions for a 110 to 220 step up transformer

So I purchased a Silvaweld preamp from Korea . Did not realize I need a step up transformer . I was told something about the pre being 220 volt . Any recommendations on where to buy a 110 to 220 volt step up transformer ?
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I have several I would sell but they are very heavy 1,000 watt units so shipping might be prohibitive. NYC area.
Amazon. Found many on the web from Amazon.

Used them for European coffee machines I bought that were 220 volt.
Will any old $15 model due ? Seen lots on the web myself .