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I think your best hope is to try to pick up a second hand one from Ebay or a dealer. The next best would be to try Silicon Chip and see if they have ever designed a variable frequency P/S unit. A kit would most likely then be available.
Unless you can design and build one yourself it would probably cost as much as a modern Goto telescope for someone to design and build it for you.
Essentially you will need a variable frequency oscillator (555 chip) or similar driving an inverter to generate 240 v AC from a DC source.
Barry
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