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Audio Research burning holes in printed circuit boards ???

I have a Audio Research ref 75 with a hole burned through the board next to one of the out-put tubes.......When you power it up it blows a 5 amp fuse in seconds, no warm up........A little hard to trouble shoot because it happens so fast  ........It has blown the b+ lead to the out put transformer in half..........I haven't heard of any problems with output transformers on these amps (Sowder)........Any ideas ???    All new tubes !!

autospec
theo's avatar
theo
2,765 posts
 

I had a REF5SE that burned the circuit board, but no holes. My problem was too many hours on the 6550 power tube. Turned out that owners manual didn’t mention that tube needed replacement at 2500 hours, only mentioned the 6H30’s were to be replaced at 4000 hours. Audio Research did replace the board under warranty and the manual for the REF6SE did include that 2500 hour note. But this was prior to AR selling to the current owners.

autospec's avatar
autospec OP
503 posts
 

Yes sir you are right on that call, you don't want to leave the 6550 voltage regulator in too long or you will have that problem.....I'm going to work on it tomorrow and try and get to the bottom of the problem, Audio Research people are real good at helping with repair issues......Greg is the best and I will be talking with him in the morning...............W

theo's avatar
theo
2,765 posts
 

I agree on Greg. I just spoke with him last week on tubes. Very good people at Audio Research

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