It's a popular misconception that the fuse in the plug top is there to protect the equipment... it isn't. It is there to protect the CABLE feeding the equipment!

There should be another fuse on the equipment itself (or possibly an MCB - Miniature Circuit Breaker) which is intended to protect the kit.

If the manufacturer has specified a 2 amp T fuse (always written by the fuseholder), it should not be replaced with a quick-blow (F), or you'll be forever changing them (or think you have a fault).

Most modern kit uses a torroidal mains transformer, and typically needs a slow-blow, because the start-up current drawn by a torroidal can be significantly higher that the maximum current the equipment actually uses. So it may even be correct to use a 13a plug top fuse, too. If in doubt, check with the manufacturer.

It's surprising how many people bring a 'faulty' amp in for 'repair' only to be educated about using the correct grade fuse!