I used to work for several European HiFi brands and ALL their fuses were marked with a "T" to indicate 'time delay', AKA Slo Blo. Example: T3.15AL250VP on the fuse itself. Meaning 3.15A 250V slo blo to us Yanks.
The sockets were also marked accordingly, no 'T'= Fast Blo, and besides, a great rule of thumb: better safe than sorry, if unsure ALWAYS replace it with a fast blo, and only then if it keeps blowing, then invest in a Slo Blo.
The sockets were also marked accordingly, no 'T'= Fast Blo, and besides, a great rule of thumb: better safe than sorry, if unsure ALWAYS replace it with a fast blo, and only then if it keeps blowing, then invest in a Slo Blo.