> My A-100 is the standard G6 case ordered from Thomann in Autumn last
> year. I presume that means a 230V 400ma T (slow blow) fuse: the GL55K

Yes I should think so. Take a peek at the PSU itself: about half way
down this page

http://www.doepfer.de/a100z_e.htm

you'll see the two types - the older A100NT12 has the 'strikethrough'
text; the newer A100PSU2 requires the higher-rated fuse, and is easily
recognised with the big round ('toroidal') transformer on it!

Tim