In the future, here's what you need to know in order to use the correct fuse for protecting your gear.
What is the total current draw of all the eqiuipment you are running on that battery:
example:
Pre-amp & A/D 800ma
DAT Recorder 300ma
Total 1100ma = 1.1 amps
Take that number and tack on ~1 amp for a cushion.
So in this situation, use a 2 amp fuse.