There seem to be some Huanyang VFDs with a "speed dial" potentiometer on the little removable control panel, and others without.
Mine came without but had the markings of its scale on the panle decal.
I opened it up and sure enough, the panel is actually dirlled behind the adhesive decal AND it has all connections and holes for one on the PCB.
I would REALLY like someone to unscrew the back of theirs WITH dial and tell me the resistance value (or codes) on the potentiometer PLEASE:cheers:
Thanks!
Joe