Hi,
A possible replacement is TRC Electronics Model #:
PSA-18U-090 (you need to specify plug type/dimensions). You can also checkout
Samsung AD1608 (though 8.4V).
Should you be challenge to build your own,
here is a simple Do-it-Yourself (DIY).
Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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