Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
We appreciate your help
in keeping this site going.
There is no shortage of devices to do the job. If it were me, I'd use a power zener diode of about 47 Volts in series with an 18 Volt regulator chip, the 7818. How much current do you need?