On Mon, 15 Apr 2019 23:32:13 -0700 (PDT)
wrote:

Hi All,

As some of you are aware, I have an old Sony Midi system complete
with turntables.

In recent years, the only thing Ive used the main boxy bit for, is
to provide 12V to drive the turntable. Id like to feed it from
something a bit more compact. But as usual, have zero budget.

For only very slightly more than zero budget you can get variable PSUs
and regulators like https://www.ebay.co.uk/itm/181961569850 or
https://www.ebay.co.uk/itm/332847087208 on eBay.

Obviously first check the drain of the existing supply, and having
obtained an appropriate regulator check its performance under load.