[Eliot Ness]

1N4007 should do the trick.  R10 shows 135 volts so just add resistance to maintain that.  Here's a good read on Selenium's:

http://w3hwj.com/index_files/RBSelenium2.pdf

I saw a burned out selenium in an old teletype stink up a whole Comm Center at NAHA Air Base in Okinawa