Vortex Sound Research

What is the correct physical size for the 1A 250V quick-blow fuse in the ESQ-M?
I've recently gotten my hands on an Ensoniq ESQ-M, and it's arrived without a fuse in the associated socket. I can't seem to find a standard size fuse that physically fits in the socket. A 5x20mm fuse rattles around, while a 6.3x32mm fuse is far too long. The service and owner's manuals don't specify any standard sizes or types here aside from the ratings of the fuse, at 1A 250V. I'm trying cylindrical glass cartridge fuses. If anyone can help here I'd really appreciate it.