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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
rrog
1,958 posts
 
Sounds like a bad 5AR4 rectifier tube. Order new rectifier tubes from Quicksilver. Might as well replace them all.
mechans
3,048 posts
 
Did you call quicksilver? Sounds like a short as suggested previously. It may not be overt or another component which you can just swap out so easily. I assume you already changed the rectifier since it is tube rectified.
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.
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