Ok need amp help poping / cracking on left channel - diyAudio
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Old 22nd November 2008, 08:50 AM   #1
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Default Ok need amp help poping / cracking on left channel

Ok I've been a long time reader (soaking up knowledge) but now i need some advice and i'm hoping you guys can help.

I have an eclipse 3001 / 3021 2 channel amplifier - Hopfully you guy's have heard of it (for those who haven't it is an oldschool amplifier that was built by the japanese are of eclpise back in the mid 90"s. The 3001 is a power supply unit accepting the 12 volt input and the 3021 in the signal amplifier. the two units are connected via 2 xlr cables 3 pin and 5 pin (ala adcom etc) to supply power from the 3001 to the 3021. similar to a pre amp and amp setup used in home audio. (help reduce noise etc.)
They were also produced under the sound monitor name in japan with a grey finish.

now on to my problem. I have an intermitant crackling / poping noise from my left channel. My first thought was a leaking capacitor so i have started checking them one by one but my question is could it possibly be something else. so far I have come up empty.

I've attached a couple of pictures of the circuit board itself for reference and have high detailed images available via e-mail (unfortunatly i can get no help from united radio in NY - or eclipse headquarters)
Attached Images
File Type: jpg 3021.jpg (93.8 KB, 46 views)
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Old 22nd November 2008, 09:29 AM   #2
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Join Date: Nov 2003
Location: Louisiana
Leaking caps would also be my first guess but leaking transistors (electrically leaky) can also cause this problem. If you heat the transistors (smaller, driver transistors) with a heat gun and the noise changes, heat each one individually until you find the defective one.
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Old 22nd November 2008, 03:05 PM   #3
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http://s489.photobucket.com/albums/rr256/intechpower/

I'm not all that familiar with photobucket but I tried to create an album with all the close up photo's I have hopefully you guys can use the link.
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