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Amp blowing fuses

I have a pair of quicksilver kt-88 monos and one is blowing 3A slo-blo fuses instantly on powerup. I have swapped all the tubes from its mate and looked at the chassis wiring which is discrete, point to point. It looks clean with no hints of overheating or trouble. I've thought about trying a 4A fuse but wanted to get opinions as maybe one of you have had a similar problem... thanks for any help, opinions etc...
rawinsonde
rleff
1,065 posts
 
can you see any signs of leakage or stress to any of the electrolytic caps;I would agree with Jea48 that it could be a shorted capacitor in the power supply circuit.
jallen
502 posts
 
Agreed on the rectifier tube or bad cap. Check for any caps leaking out material. I would bet it is a tube though. I have 3 pair of quicksilvers and never a bad cap. Jallen
visualsound's avatar
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visualsound
3 posts
 
Pull the rectifier tube out of it's socket, replace the fuse with the correct value then turn it on. If it blows again, instantly, you have a shorted power transformer.
hifigeek1
770 posts
 
It could also be a problem with the filament supply i.e. bridge rectifier, and not the high voltage supply. Hard to say without a circuit diagram.
yogiboy's avatar
yogiboy
5,675 posts
 
I had the same problem years ago and it turned out it was a bad cable from preamp to amp.Try changing the cable,it just might be the problem.
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