Are all fuses created equal?

My question is not regarding the sonic capabilities of audiophile fuses but is specific to standard fuses and their protective capacity. After all there is the ongoing thread "fuses that matter" that is debating the topic of the sonic capabilities of fuses to death.

The reason for my question is that I recently blew a fuse on my power amp (tube amp). I replaced it with a standard fuse that was rated the same the stock one (2a slow blow). It was purchased from electronics parts distributor. when comparing the new fuse to the stock fuse, I noticed that new one was constructed flimsily. But both were rated the same.

After replacing the fuse while adjusting the bias I shorted one of the output tubes. I immediately shutdown the amp and upon inspection of the fuse it is unclear as to whether it failed (as it should have) or wether it survived the incident. This has prompted me to worry that maybe the fuse had something to do with the shorting of the tube. It is clear to me that the tube in question was nearing the end of its useful life, therefore causing the stock fuse fail in the first place. Regardless, if the tube was faulty the new fuse should have failed as the stock one did.

@Realremo, is changing the fuse type from slo to fast blow wise? I am not convinced, if the circuit was designed with a given fuse type I am not comfortable second guessing the design.

One small side bar regarding the rating of the fuses, engraved on the fuses are the following markings:

stock fuse:
buss
250v
2A
MDL
CSA / UL (logos)

New fuse:
CQ
250v
2A
ADL
CSA / UL (logos)

Does anyone know if these marking have any bearing. Most specifically the MDL vs ADL designations?

thanks

Al thanks for the input. After some quick research I found the data sheet for the ADL fuse, it is from Conquer here is the data sheet.

So the question now is, what aspect of the data must be compared?

Thanks again

Al, I guess that answers my question, there is little difference between fuses manufactured by reputable companies. At least as applies to the two brands in question.

I will rest easy knowing that damage done to my amp had nothing to do with the fuse selection. And, I will be far more cautious in terms of checking my tubes if a fuse ever blows again.

Thanks again.

@Marakentz the nice thing about Wiki is that if the information is missing or is not to your liking you can always add or change it. I look forward to learn about fuzzes!

Update, I got my amps back from service this week, it turns out that only the led for the bias adjustment was fried. So I guess the fuses served their purpose after all.

I would also like to take this opportunity to thank Quicksilver who graciously honoured the three year warranty which had elapsed about a month before the amp failed.

@syntax my amps point towards the magnetic north such to align them with the earth's magnetic fields.