Gareth Magennis wrote:

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I recently keep coming across brand new unsold equipment which has been
supplied with a fast blow mains fuse that has blown at turn on.

This is from more than one manufacturer.


** A friend who did Fender warranty work was getting a lot "failed on the showroom floor" amps. Always the same, an F1A or F1.6A supply fuse popped. Fitted a T fuse instead and no more problem. Of course, the fuses concerned were buried inside on the main PCB !!

T fuses were not always easy to buy, so it was common to use an oversize F fuse instead - labelling often encouraged you to do so.

Whatever the combination of dumb ideas, it is not hard to do a number of on-off cycles while keeping a close eye on an F fuse. If it bends severely at switch on it's gonna fail soon.



..... Phil