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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
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
5,711 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.
rawinsonde OP
47 posts
 
Thanks for all your help and suggestions. I will try the preamp cable swap and try powering up without the rectifier tube before looking for a repair shop...
rawinsonde OP
47 posts
 
Hi, I pulled the rectifier tube out, inserted a 3A SB fuse, turned on power and the fuse did blow. How certain are you about the problem being a shorted power transformer? There is no visual indication (top or underside) of damage.
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