However if you want to live dangerously, and your circuit breaker is up to the job, you can always try to substitute a 13 amp fuse for a 3/5 amp one.
Yeah, we've covered why this idea and also the idea of "soldering a straight wire instead of a fuse" is a completely BAD idea in another thread. The problem here is putting a 13A fuse in a preamp type device that normally has a 1-2A fuse. The transformer and power supply may never pull 13A of current even if there is a short somewhere in the circuit. This means that the device will not necessarily pop the main 15A house circuit breaker and will constantly be a current drain that can heat the device internals to a point where it can cause a fire. That is the primary reason why fuses/circuit breakers need to be sized carefully.