Hello again. Do all moder n preamps have fuses? I was thinking of changing out the fuse in my ayre k5xemp to a sr black , seeing how everyone is claiming improvements in sq. So, i opened it up to check size, but couldnt find a fuse. A transformer, and circuit board and such. Could it be under the circuit board? Thanks!" Could it be under the circuit board?" no
Many today have things that can look like a resistor or I’ve seen ones that are square or even round, all of these are soldered in, leave well enough alone.
http://www.directindustry.com/industrial-manufacturer/fuse-resistor-101583.html
Cheers George