I have a Sansui AU-D907FE 130 WPC Amplifier that keeps blowing fuses in the 500W 240V to 100v Stepdown Transformer. Australian 240v to Japanese 100v. Would the Transformers original 3.5 amp fuses be blowing because they should be bigger or do I need a bigger 1000Watt Stepdown Transformer?
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Does it blow in the middle of use? Or does it blow when you first turn it on?
Should it be a slow blow fuse type?
Should it be a slow blow fuse type?
My daughter has the amplifier, I rang her and quizzed her on what actually happened? She said they had a power surge that blew up the fridge and she must have had the transformer on at the time and it was already blown when she turned it on? I told her to replace the fuse with an original 3.5 amp fuse but she used a 3 amp fuse instead, I don't know if it was a slow blow or what but she is going to ask the guy behind the counter when she buys some fuses which ones she should use?
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The power surge makes me recall a friend's unhappy experience. He lost the neutral line from the power pole (120V-neutral-120V), leaving various 120V-rated appliances and electronics connected in series with 240V applied. Unbalanced loads made for lots of damage. Power delivery is probably different in Australia.
Thoughts: Was the original fuse slow-blow? Whatever worked before should continue to.
The transformer should tested first without the amplifer attached. If all is well, (no blowing fuses) then try again with amplifier connected.
I hope it's only a choice-of-fuse issue. Good luck!
Thoughts: Was the original fuse slow-blow? Whatever worked before should continue to.
The transformer should tested first without the amplifer attached. If all is well, (no blowing fuses) then try again with amplifier connected.
I hope it's only a choice-of-fuse issue. Good luck!
Oh, completely forgot the amp, assumed it was unplugged.
As BSST said, definitely plug in the step down with NO amplifier plugged into it. The fuse may be blowing because the amplifier is blown up by your surge.
As BSST said, definitely plug in the step down with NO amplifier plugged into it. The fuse may be blowing because the amplifier is blown up by your surge.
My daughter said the guy behind the counter didn't have any 3.5 amp fuses and he didn't know if she would need slow blow or fast blow? So I need to know if I should order a slow blow or fast blow, I cant seem to find out which? My daughter doesn't have the original fuse to go by? I have emailed the company I bought the stepdown transformer from but they have one of the worst customer services I've come across. They may reply its a toss-up if they do or not? It's a shame because they make good gear.
My guess is that fast blow ought to be OK would be a bit more conservative re protection. Even the 3A fuse should permit 720 W of power. I fear there's been damage--- most likely to the amp. Again, my guess is that experiments with 3A fast blow will tell the story.
Good luck!
Good luck!
I will ask my daughter to drop the amp and stepdown transformer off when she come down this way next, lucky I have two spare sets of output transistors for it. Thanks for the advice fellas, its appreciated.