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Cary amp fuse blowing 1 advice 2 Bay Area fix?

Hi. Well, starting yesterday, when I turn on my Cary SLI-80, after around one minute, the fuse blows on the left hand side. Tried it twice now.

1. Could this possibly be due to a bad tube? All the tubes appear to light up fine. Is it worth experimenting with swappping tubes, trying to nail down the bad one (I'd hate to put my amp through six more blown fuses while I experiment unless it's likely to find the cause.)

2. I'm always inclined to send a unit back to the manufacturer for repair. That of course takes weeks round trip plus risk of damage or loss. SO, if any of you know someone in the BAY AREA, Northern California, that could fix this, that might be preferable.

Thank you!
Art
artmaltman
artmaltman OP
769 posts
 
I called Gerald at Cary, and he suggested it probably was the power tube. And to be extremely careful with the bias setting.

I checked the manual and there is an AC fuse (which did not blow) and two "tube fuses" (one of which did blow). The tube fuse is correctly half-amp 250 volt quick blow.

Sounds promising.
I'll update this tomorrow.

Thanks,
Art
artmaltman OP
769 posts
 
Tubes it was. I swapped in a set of Svetlana KT-88's and it'a biasing fine now and sounding great.
Thanks all.
Art
zimmerma's avatar
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zimmerma
102 posts
 
I too have had fuse-blowing difficulties with Cary amps.

With my CAD V12, Dennis Had himself recommended that I replace the 3 amp slo blo with a four amp.

And with my CAD 2A3 SET, Albert at Space-Tech Labs lowered the voltage (and thus the wattage) to a safer level than the excessively high original Had design.
In fact, I am considering having Albert do the same thing with my V12.

It seems that Dennis Had designs his own amps with a very high voltage level for the purpose at hand... it does jack up the wattage rating, but is very bad for tube life, not to mention the inconvenience of blowing fuses of the manufacturer's own recommended rating!
dmsmusiq
2 posts
 
Hello, I've had this happen twice. Once in a SLAM 100 and once in my SLM 200. Both times is was a bad Jensen coulping oil cap that are sometimes prone to fail. I replaced with a higher voltage Mundorf silve & oil cap with a 1200v rating as oppose to the 600v rating of the Jensen and had no further problems. By the way the Mundorf caps brought an already great sounding amp to a level of musicality that was stunning to say the lease. I've had various Cary amps over the last 10yrs and this is the best upgrade I've heard in them. Hope this helps. Dmsmusiq in SACTO.
gethyper
1 posts
 
I think I may have blown the amp fuse. Has anyone here ever replaced that one?
-A
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