If it looks like a thin straight wire its fast. If it looks like a coiled spring, or anything other than a thin wire, its slow.
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So far I been unsuccessful to get an answer from Optoma, AA was not helpful neither my last resource is the audio forums and that's the reason to be bugging around here.I did took a look at the fuse is a 3.15 amp 5x20mm at this size is deceiving to judge slow or fast blow just looking at the filament (at least for me)
Peace and stay healthy!
hiphileThese look very much to be a re-baged Job225
Nuforce STA200: http://hifipig.com/wp-content/uploads/2015/06/20150212_161556-1-1024x576.jpg
From the 225 discussions "Job 225 - 4A Slow-Blow Small"