04-06-2019, 10:18 AM
The 5R4 has a maximum current rating of 250ma, generally make dandy subs for 5U4, but watch current as 5U4GB can handle 275ma. Probably not a issue, most any equipment that draws over 200-225ma likely uses two rectifiers. The 5U4GA is rated 250ma, orig 5U4G only 225ma.
Tom