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something wrong with speaker output B on kenwood kr-720

Rex Aeterna

Rex Aeterna

Gigolo of Gigolos
hey just wondering what's wrong. it's very odd. if i use speaker b outputs with anything my amp gets hot real quick. i noticed this last night when i played my speakers and left channel was distorting and i started to smell something so i clicked off right away and unhooked everything. luckily nothing actually happened to the amp itself and still perfect working order....that is if i use only speaker A output section. i can run everything perfectly fine through speaker A outputs and the amp will run nice and cool. only if i even attempt to use speaker B it get hot insanely quick.

can't check anything as of now since my multi-meter has blown fuse. just wondering if anyone can make an educational guess right off the bat to know what the problem possibly can be? it was serviced as well about few months ago and had it's dc offset and bias adjusted to specs and so forth if anyone is curious.
 
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my speakers are 6ohms nominal and i only use one pair so it shouldn't be too stressful i think and been running fine off speaker output A or B. i never ran any speakers together on A&B before on it.

i think i found what it was. or seem like i fixed. i opened up to see anything was contacting each other at all or dirt in anyway and noticed the 250v 4A fuse was almost blown somehow. he must of put a faulty 4A fuse or something. it wasn't completely blown but burnt in the middle. i replaced it with new 250v 4A fuse and no more problems. it doesn't get hot anymore. i think it was the bad fuse doing it.
 
probably. i don't know the fuse was burnt in the middle.maybe somehow came loose from th contact. i have no clue,but seems working fine now and i watched the new fuse while i was listening to the tuner and checking it and seems fine now.i don't see,smell or feel anything from it anymore.
 
was told 35 years ago the difference between a blown fuse and a melted fuse ..a melted fuse is generally cause by a bad connection . a blown fuse is caused by a short ..that is not to be taken literally but can help in diagnosis sometimes
 
Fuse elements can actually wear thin. Back in my distribution days it was common practice to replace line fuse elements about every 5-7 years in substations. Then again, that was back when substation switchgear maintenance was an annual ritual.
 
Watthour said:
Fuse elements can actually wear thin. Back in my distribution days it was common practice to replace line fuse elements about every 5-7 years in substations. Then again, that was back when substation switchgear maintenance was an annual ritual.
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i didn't know that. maybe that can explain it. maybe he didn't look and placed an old fuse inside when he fixed it. i think he keeps whole bunch of older spare parts cause he's been repairing electronics for over 30 years now.
 
Might there be a tiny piece of wire causing a short between the "B" set of speaker connections?
 
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