Or you could retrofit a 9v pcb into it, I dunno if madbean is still doing his current lover board you could try that, or if you feel like etching your own you could have a look at
THIS more about it
HERE. probably a far cheaper alternative with the benefit of running it off your usual 9v supply. £25 for a vintage enclosure, knobs and whatever else you can salvage wouldn`t be too bad.
If it wasn't for this website I would definitely have a life.